Wednesday, August 3, 2011
Saturday, June 11, 2011
Alumunium 6061 -- 7005
6061 Vs. 7005 Aluminum for Bikes
You can’t tell the differences between the 6000 series and the 7000 series of aluminum bikes by looking at them. But the compounds and qualities of the aluminum are different. They are different to allow for more affordability, to give the buyer a choice between certain aspects of performance versus cost.
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Formula
- When aluminum is cast, it is mixed with other minerals to impart different qualities to the metal. 6061 aluminum is cast with magnesium as its primary additive. 7005 aluminum is cast with zinc as its primary additive. Both formulas have different qualities of lightness, strength and cost. 6061 aluminum is cheaper, thus making a bike built from it more affordable. It’s more costly to use zinc as an aluminum additive, making the 7005 series more expensive.
Strength
- While the strength of most bike frames is not much of an issue, when bike frames continue to get thinner and lighter, strength can be a deciding factor. Magnesium frames are not as hard as zinc frames. This makes the 7005 the better choice if your frame is extremely light such as on some elite road bikes. For mountain bikes that have a bigger tube design, 6061 aluminum is strong enough.
Ride
- Due to its inherent hardness, 7005 aluminum bikes feel rougher when you ride them. You might not realize it, but bike frames bend when you ride the bike. They absorb bumps and road vibration. The 6061 alloy is softer, making the bike’s ride more comfortable. The stiffness of the 7005 frame make its ride more harsh. For smoother riding bikes, choose 6061 frames.
Appeal
- If you care about fashion, keeping up with the latest trends, or want to have the highest priced aluminum bike, you would want to choose the more expensive 7005. 7005 bikes also have more expensive components, and the bike will probably be slightly lighter due to this fact alone. A 6061 bike will cost hundreds of dollars less, though, and will do virtually anything a 7005 bike can do.
The biggest difference is WHO is making the actual frames...
and what facilities they have for production. 6000 series alloys require more post welding procedures to have adequate strength for
usage as a structural material than 7000 series alloys, but they
are slightly easier to work with, have a VERY slight (like 0.002
pounds per cubic inch) density advantage, and somewhat better corrosion resistance. On an aircraft you'd typically see a 6000 series
alloy used for the external skin and a 2000 or 7000 alloy used for
internal framing and structural supports.
Simply using one alloy or another is not going to make a frame lighter
or not. That depends on the frame designer and how he manipulates the
tube sizes, wall thicknesses and so forth.
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Friday, June 10, 2011
Stumpjumper
The Specialized Stumpjumper is a mountain bike produced by Specialized Bicycle Components. When it was first produced in 1981, the Stumpjumper was the first mass-production mountain bike. The Stumpjumper is still in production, although its design has changed significantly since it was first sold. Stumpjumpers have been raced professionally by riders including Christoph Sauser and Ned Overend.
http://upload.wikimedia.org/wikipedia/commons/4/44/P1080421_resize.JPG
After the first production run in 1981, around 500 were imported to the United States over the course of the next year.[4][6] The original Stumpjumper was sold for US$750 as a complete bike or $395 for the frame only.[4] Specialized marketed it as an affordable and versatile bike for a new sport, namely mountain biking,[4] and used the slogan "The bike for all reasons".[7] Initially, bike retailers were sceptical about the Stumpjumper, with some asking Sinyard what he was doing with a "big kids' BMX".[7] However, the first shipment of 125 bikes sold out in six days.[8] According to sports journalist Ben Hewitt, the Stumpjumper "was a resounding success" and its introduction contributed to the rapid rise in popularity of the new sport.[5]
An original Stumpjumper is displayed in the Smithsonian Institution in Washington, D.C.[9][10] A limited edition reproduction of the original Stumpjumper, featuring modern components and named the Stumpjumper Classic, was produced in 2007 to mark the bike's 25th anniversary. It was available for US$1,300.[11]
http://upload.wikimedia.org/wikipedia/commons/4/44/P1080421_resize.JPG
Contents[hide] |
History
Specialized started to produce the Stumpjumper in 1981, making it the first mass-production mountain bike.[1][2] The first Stumpjumper was produced in Japan and was based on a design for a custom-made bike originally marketed by Tom Ritchey, Gary Fisher and Charles Kelly.[3] Specialized's founder Mike Sinyard has explained that the company's aim was to "make a bike on a production basis but as though it was a custom bike". The first Stumpjumpers had welded steel frames because the lugged and brazed frames that designer Tim Neenan wanted to use were not available at the time. The original bike had a modiļ¬ed BMX stem and handlebars based on Magura motorcycle handlebars.[4] The bike was equipped with 15-speed[5] Suntour ARX GT gears, originally designed for use on road bikes, and the Stumpjumper also featured Mafac cantilever brakes and a TA Cyclotourist chainset, both designed for touring bikes.[4] It had no suspension. The bike weighed just under 30 pounds (14 kg).[2]After the first production run in 1981, around 500 were imported to the United States over the course of the next year.[4][6] The original Stumpjumper was sold for US$750 as a complete bike or $395 for the frame only.[4] Specialized marketed it as an affordable and versatile bike for a new sport, namely mountain biking,[4] and used the slogan "The bike for all reasons".[7] Initially, bike retailers were sceptical about the Stumpjumper, with some asking Sinyard what he was doing with a "big kids' BMX".[7] However, the first shipment of 125 bikes sold out in six days.[8] According to sports journalist Ben Hewitt, the Stumpjumper "was a resounding success" and its introduction contributed to the rapid rise in popularity of the new sport.[5]
An original Stumpjumper is displayed in the Smithsonian Institution in Washington, D.C.[9][10] A limited edition reproduction of the original Stumpjumper, featuring modern components and named the Stumpjumper Classic, was produced in 2007 to mark the bike's 25th anniversary. It was available for US$1,300.[11]
Present day
Specialized continue to produce the Stumpjumper, which, like mountain bikes in general, has evolved significantly since 1981 and now comes in full (front and rear) suspension and hardtail (front suspension only) options, with the former named the Stumpjumper FSR.[12]Use by professional riders
Professional mountain bikers who ride Stumpjumpers include Christoph Sauser[13] and Ned Overend.[14] Overend won the 1990 Mountain Bike World Championships – the first ever event of its kind – on a carbon-fiber prototype Stumpjumper.[Mountain Bike -- Sepeda Gunung
The history of the mountain bike includes contributions from cyclo-cross in Europe, the Roughstuff Fellowship in the UK, and modified heavy cruiser bicycles used for freewheeling down mountain trails in Marin County, California. However, it was not until the late 1970s and early 1980s that road bicycle companies started to manufacture mountain bicycles using high-tech lightweight materials. Specialized introduced the first major production mountain bike in the world, the Stumpjumper, in 1981.[1][2] Throughout the 1990s and 2000s, mountain biking moved from a little-known sport to a mainstream.
Equipment
Bike
- Mountain bikes differ from other bikes primarily in that they incorporate features aimed at increasing durability and improving performance in rough terrain. Most modern mountain bikes have front fork or dual suspension, 26 inch and also 29 or 27.5(650b) inch diameter tires, usually from 1.7 to 2.5 inches in width, and a wider, flat or upwardly-rising handlebar that allows a more upright riding position, giving the rider more control. They have a smaller, reinforced frame, usually made of wide tubing. Tires usually have a pronounced lugged tread, and are mounted on rims which are stronger than those used on most non-mountain bicycles. Compared to other bikes, mountain bikes also tend to more frequently use disc brakes. They also tend to have lower ratio gears to facilitate climbing steep hills and traversing obstacles. Pedals vary from simple platform pedals, where the rider simply places the shoes on top of the pedals, to clipless, where the rider uses a specially equipped shoe with a sole that engages mechanically into the pedal. Pedals with toe cages (clips) are rarely used anymore as they take longer to get out of than clipless or platform if one takes a fall on the rough terrain.
Generally speaking, enhanced durability and off-road capabilities also result in a heavier bicycle weight to rider ratio than road touring bicycles.[3]
Accessories
- Gloves differ from road touring gloves, are made of heavier construction, and often have covered thumbs or all fingers covered for hand protection. They are sometimes made with padding for the knuckles.
- Glasses with little or no difference from those used in other cycling sports, help protect against debris while on the trail. Filtered lenses, whether yellow for cloudy days or shaded for sunny days, protect the eyes from strain. Downhill and freeride mountain bikers often use goggles similar to motorcross or snowboard goggles in unison with their fullface helmets.
- Shoes generally have gripping soles similar to those of hiking boots for scrambling over un-ridable obstacles, unlike the smooth-bottomed shoes used in road cycling. The shank of mountain bike shoes is generally more flexible than road cycling shoes. Shoes compatible with clipless pedal systems are also frequently used.
- Clothing is chosen for comfort during physical exertion in the backcountry, and its ability to withstand falls. Road touring clothes are often inappropriate due to their delicate fabrics and construction.
- Hydration systems are important for mountain bikers in the backcountry, ranging from simple water bottles to water bags with drinking tubes in lightweight backpacks (e.g., Camelbaks).
- GPS navigation device is sometimes added to the handlebars and is used to display and monitor progress on trails downloaded from the internet or pre-made mapping systems, record trails on the fly, and keep track of trip times and other data. The GPS system is often a handheld GPS device with color screen and rugged, waterproof (IPX7) design.
- Pump to inflate flat tires.
- Bike tools and extra bike tubes are important, as mountain bikers frequently find themselves miles from help, with flat tires or other mechanical problems that must be handled by the rider.
- High-power lights based on LED technology, especially for mountain biking at night.
Protective gear
The style and level of protection worn by individual riders varies greatly and is affected by many factors including terrain, environment, weather, potential obstacles on the trail, experience, technical skill, fitness, perceived risk, desired style and others too numerous to mention. A cross-country helmet and simple long fingered gloves are a good minimum for the majority of riding.
Limb protection becomes important when speeds rise, surfaces become loose and sketchy, terrain technical and crashes more common and more severe. Full-face helmets and armored suits or jackets are more suited to "gravity" and "air"-orientated disciplines which use jumps and drops, where their extra bulk and weight is outweighed by the bigger and more frequent crashes with worse consequences. Still, within XC community, the typical road-racing attire is what most riders use. Whatever protection is used it should fit well, be comfortable (or it won't be worn) on the bike as well as in the shop and suited for the particular type of riding. Gloves can offer increased comfort while riding, by alleviating compression and friction, and protection in the event of strikes to the back or palm of the hand or when putting the hand out in a fall. Gloves also protect the hand, fingers, and knuckles from abrasion on rough surfaces such as concrete. Many different styles of gloves exist, with various fits, sizes, finger lengths, palm padding and armor options available. Armoring knuckles and the backs of hands with plastic panels is common in more extreme types of mountainbiking.
- Helmets provide important head protection. The use of helmets, in one form or another, is almost universal amongst all mountain bikers. The main three types are cross-country, rounded skateboarder style (nicknamed "half shells" or "skate style") and full face. Cross-country helmets tend to be light and well ventilated, and more comfortable to wear for long periods, especially while perspiring in hot weather. In XC competitions, most bikers use the usual road racing style helmets, for their lightweight and aerodynamic qualities. Skateboard helmets are simpler and cheaper than other helmet types; provide greater coverage of the head and resist minor scrapes and knocks. Unlike road biking helmets, skateboard helmets typically have a thicker, hard plastic shell which can take multiple impact before it needs to be replaced. The trade-off for this is that they tend to be much heavier and less ventilated (sweatier), therefore not suitable for endurance-based riding.Full-face helmets (BMX-style) provide the highest level of protection, being stronger again than skateboard style and including a jaw guard to protect the face. The weight is the main issue with this type but nowadays they are often relatively well ventilated and made of high-tech materials, such as carbon fiber. As all helmets should meet minimum standards, SNELL B.95 (American Standard) BS EN 1078:1997 (European Standard), DOT or "motorized ratings" are making their way into the market. The choice of helmet often comes down to rider preference, likelihood of crashing and on what features or properties of a helmet they place emphasis. Helmets are mandatory at competitive events and almost without exception at bike parks, most organisations also stipulate when and where full-face helmets must be used.
- Body armor and pads, often referred to simply as "armor", protect limbs and trunk in the event of a crash. While initially made for and marketed at downhillers, freeriders and jump/street riders, body armor has trickled into other areas of mountain biking as trails have become faster and more technical. Armor ranges from simple neoprene sleeves for knees and elbows to complex, articulated combinations of hard plastic shells and padding that cover a whole limb or the entire body. Some companies market body armor jackets and even full body suits designed to provide greater protection through greater coverage of the body and more secure pad retention. Most upper body protectors also include a spine protector that comprises plastic or metal reinforced plastic plates, over foam padding, which are joined together so that they articulate and move with the back. Some mountain bikers also use BMX-style body armor, such as chest plates, abdomen protectors, and spine plates. New technology has seen an influx of integrated neck protectors that fit securely with full face helmets. There is a general correlation between increased protection and increased weight/decreased mobility, although different styles balance these factors differently. Different levels of protection are deemed necessary/desirable by different riders in different circumstances. Backpack hydration systems such as Camelbaks where a water filled bladder is held close to the spine used by some riders for their perceived protective value. However, there is only anecdotal evidence of protection and with the exception of one specific product by the company Deuter, they are never sold as spine protection.
- First aid kits are often carried by mountain bikers, so that they are able to clean and dress cuts and abrasions and splint broken limbs. Experienced mountain bike guides may be trained in dealing with suspected spinal injuries (e.g., immobilizing the victim and keeping the neck straight). Seriously injured people may have to be removed by stretcher, by a motor vehicle suitable for the terrain, or by helicopter.
Types
Mountain biking is dominated by these major categories:
- Cross-Country (XC) is the most popular form of mountain biking, and the standard for most riders. It generally means riding point-to-point or in a loop including climbs and descents on a variety of terrain. A typical XC bike weighs around 9-13 kilos (20-30 lbs), and has 0-125 millimeters (0-5 inches) of suspension travel front and sometimes rear.
- All-mountain (AM) bike category typically provides 125-180 millimeters (5-7 inches) of rear and front suspension travel and stronger components than XC models, while still providing overall weight suitable for climbing and descending on a variety of terrain.
- Downhill (DH) is, in the most general sense, riding mountain bikes downhill. The rider usually travels to the point of descent by other means than cycling, such as a ski lift or automobile, as the weight of the downhill mountain bike often precludes any serious climbing. While cross country riding inevitably has a downhill component, Downhill (or DH for short) usually refers to racing-oriented downhill riding. Downhill-specific bikes are universally equipped with front and rear suspension, large disc brakes, and use heavier frame tubing than other mountain bikes. Because of their extremely steep terrain (often located in summer at ski resorts), downhill courses are one of the most extreme and dangerous venues for mountain biking. They include large jumps (up to and including 12 meters (40 feet)), drops of 3+ meters (10+ feet), and are generally rough and steep top to bottom. To negotiate these obstacles at race speed, racers must possess a unique combination of total body strength, aerobic and anaerobic fitness, and mental control. Minimum body protection in a true downhill setting is knee pads and a full face helmet with goggles, although riders and racers commonly sport full body suits to protect themselves. Downhill bikes now weigh around 16-20 kilos (35-45 lbs), while professional downhill mountain bikes can weigh as little as 15 kilos (33 lbs), fully equipped with custom carbon fibre parts, air suspension, tubeless tires and more. Downhill frames get anywhere from 170-250 millimeters (7 to 10 inches) of travel and are usually mounted with a 200 millimeter (8 inch) travel dual-crown fork.
- Four-cross/Dual Slalom (4X) is a sport in which riders compete either on separate tracks, as in Dual Slalom, or on a short slalom track, as in 4X. Most bikes used are light hard-tails, although the last World Cup was actually won on a full suspension bike. The tracks have dirt jumps, berms, and gaps. Professionals in gravity mountain biking tend to concentrate either on downhill mountain biking or 4X/dual slalom because they are very different. However, some riders, such as Cedric Gracia, still do 4X and DH, although that is becoming more rare as 4X takes on its own identity.
- Freeride / Big Hit / Hucking. Freeride, as the name suggests is a 'do anything' discipline that encompasses everything from downhill racing without the clock to jumping, riding 'North Shore' style (elevated trails made of interconnecting bridges and logs), and generally riding trails and/or stunts that require more skill and aggressive techniques than XC. Freeride bikes are generally heavier and more amply suspended than their XC counterparts, but usually retain much of their climbing ability. It is up to the rider to build his or her bike to lean more toward a preferred level of aggressiveness. "Slopestyle" type riding is an increasingly popular genre that combines big-air, stunt-ridden freeride with BMX style tricks. Slopestyle courses are usually constructed at already established mountain bike parks and include jumps, large drops, quarter-pipes, and other wooden obstacles. There are always multiple lines through a course and riders compete for judges' points by choosing lines that highlight their particular skills. A "typical" freeride bike is hard to define, but 13-18 kilos (30-40) lbs with 150-250 millimeters (6-10 inches) of suspension front and rear.
- Dirt Jumping (DJ) is one of the names given to the practice of riding bikes over shaped mounds of dirt or soil and becoming airborne. The idea is that after riding over the 'take off' the rider will become airborne, and aim to land on the 'landing'. Dirt jumping can be done on almost anything but the bikes are generally smaller and more maneuverable hardtails so that tricks e.g. backflips, are easier to complete. The bikes are simpler so that when a crash occurs there are fewer components to break or cause the rider injury.
- Trials riding consists of hopping and jumping bikes over obstacles, without touching a foot onto the ground. It can be performed either off-road or in an urban environment. It requires an excellent sense of balance. The emphasis is placed on techniques of effectively overcoming the obstacles, although street-trials (as opposed to competition-oriented trials) is much like Street and DJ, where doing tricks with style is the essence. Trials bikes look almost nothing like mountain bikes. They use either 20", 24" or 26" wheels and have very small, low frames, some types without a saddle.
- Urban/Street is essentially the same as urban BMX (or Freestyle BMX), in which riders perform tricks by riding on/over man made objects. The bikes are the same as those used for Dirt Jumping, having 24" or 26" wheels. Also, they are very light, many in the range of 25-30 lbs, and are typically hardtails with between 0-100 millimeters of front suspension. As with Dirt Jumping and Trials, style and execution are emphasized.
- Mountain Bike Touring is long distance touring on dirt roads and single track with a mountain bike. With the popularity of the Great Divide Trail, the Colorado Trail and other long distance off road biking trails specially fitted mountain bikes are increasingly being used for touring. Bike manufacturers like Salsa have even developed MTB touring bikes like the Fargo model. Mixed Terrain Cycle-Touring or rough riding is a form of mountain bike touring but involves cycling over a variety of surfaces and topography on a single route, with a single bicycle. The recent popularity of mixed terrain touring is in part a reaction against the increasing specialization of the bike industry. Focusing on freedom of travel and efficiency over varied surfaces, mixed terrain bicycle travel has a storied past.
Risks
The risk of injury is inherent in the sport of mountain biking, especially in the more extreme disciplines such as downhill biking. Injuries range from relatively minor wounds, such as cuts and abrasions from falls on gravel to serious injuries such as striking the head or spine on a boulder or tree.
Protective equipment can protect against minor injuries, and reduce the extent or seriousness of major impacts, but it cannot protect a rider against the most serious impacts or accidents. To truly reduce the risk of injury, a rider needs to take steps to make injuries less likely, such as picking trails that they can handle given their experience level, ensuring that they are fit enough to deal with the trail they have chosen, and keeping their bike in top mechanical shape. If a mountain biker wishes to explore more dangerous trails or disciplines (types of mountain biking) such as downhill riding, they will need to learn new skills, such as jumping and avoiding obstacles.
Fitness is another issue; if a rider is not in good enough shape to ride a certain class of trail, they will become fatigued, which puts them at a higher risk of having an accident.
Lastly, maintenance of one's bike needs to be done more frequently for mountain biking than for casual commuter biking in the city. Mountain biking places much higher demands on every part of the bike. Jumps and impacts can crack the frame or damage the derailleurs or the tire rims, and steep, fast descents can quickly wear out brake pads. Thus, whereas a casual in-the-city rider may only check over and maintain their bike every few months, a mountain biker should check and properly maintain the bike before every ride.
Monday, May 30, 2011
MANFAAT MENGGUNAKAN BAR END PADA MTB / HYBRID BIKE
Bar Ends, merupakan salah aksesoris pelengkap yang digunakan di sepeda MTB atau Hybrid yang menggunakan Flatbar. Artikel ZS terdahulu mengenai Tips bersepeda ditanjakan, bar ends pernah sedikit dibahas.
Tidak ada salahnya kita memahami lebih mendalam, kelebihan dan kekurangan penggunaan Bar ends pada sepeda terutama MTB Hard Trail dan Hybrid Bike.
Bar Ends MTB Hardtrail
Bar ends merupakan salah satu komponen pelengkap dalam bersepeda, merupakan ektensi yang terpasang diujung setang kemudi sepeda. Pada umumnya Bar ends dipasang di MTB Hardtrail dan Hybrid. Para rider menggunakan Bar ends bertujuan memberikan variasi jenis peganggan ketika berkendara dan dapat mengatuh posisi tubuh ketika riding.
Bar ends dapat juga meningkatkan kenyamanan bagi pengendara karena posisi tangan yang netral (telapak tangan ke dalam). Posisi tangan yang nyaman memberikan efek lebih pada ketegangan otot tangan ketika riding.
Grip Bar ends
Beberapa Bar ends sudah include dengan stang kemudi alias dilas menjadi satu dengan handlebar atau menjadi satu dengan handlegrip. Bar ends mulai populer di awal 1990-an, mulai ditinggalkan ketika akhir tahun 1990-an. Dalam beberapa kasus, Bar ends menyulitkan rider ketika melintas medan yang berkelok, penggunaan bar ends yang terlampau panjang juga dapat mengganggu kenyamanan ketika melintas dimedan cross country yang banyak pepohonan.
Ergo Bar Ends
Penggunaan Bar ends juga memberikan efek negatif ketika melakukan pengereman mendadak, karena rider harus memidah posisi tangan sehingga sepeda tidak berhenti seketika.
Berikut Kelebihan dan kekurangan penggunaan Bar ends.
Kelebihan :
- Memberikan kenyamanan riding ditanjakan
- Memungkinan tubuh untuk bernafas lebih nyaman, karena bagian atas tubuh terbuka.
- Beberapa model Bar ends dapat melindungi tangan anda ketika jatuh (posisi tangan normal).
- Membantu mencegah kelelahan (fatigue) dengan menawarkan lebih banyak variasi posisi tangan.
- Sedikit banyak membantu menambah kecepatan, karena posisi rider menjadi lebih menunduk.
Kekurangan :
- Menambah berat sepeda, karena adanya komponen tambahan.
- Jika menggunakan Flatbar berbahan Carbon, resiko setang kemudi patah sangat besar.
- Bar ends yang banyak beredar memakan kurang lebih 1Inch handlebar, jika anda rider yang memiliki bahu yang lebar tentunya penggunaan bar ends sedikit mengganggu kenyamanan.
- Peningkatan resiko cidera ketika crash, posisi tangan pada bar ends.
Tips pemasangan Bar ends :
Tidak ada aturan baku mengenai sudut kemiringan bar ends, kita dapat memulainya dari sudut 45 derajat. Jika dirasa posisi tangan terlalu maju kedepan atau terlampau kebelakang aturlah sesuai kenyamanan ketika ridding.
Specialized Carbon Bar ends
Bar ends yang panjang dan terpasang terlampau kebelakang membuat sepeda terlihat kurang menarik dan menambah resiko ketika jatuh .
Gunakanlah Bar ends yang egronomis sesuai dengan lekukan gengaman tangan, bar ends yang egronomis memberikan kenyamanan lebih ketika touring jarak jauh.
Carbon Bar ends
Jika kocek berlebih tidak ada salahnya menggunakan Bar ends berbahan carbon (mengurangi bobot sepeda) atau grip handlebar yang include dengan bar ends.
Jika ada menggunakan riser bars, ada baiknya jangan menambah bar ends. Selain fungsinya menjadi terkecualikan, banyak rider yang akan melihat tampilan sepeda anda terlihat aneh.
H/a/p/p/y C/y/c/l/i/n/g
Thursday, May 26, 2011
Manfaat Bersepeda ...
SAKIT PUNGGUNG, sakit punggung biasanya sering diakibatkan hasil secara langsung oleh kurangnya berolah raga. Dengan kurangnya berolah raga maka menyebabkan discs (piringan-piringan) pada tulang punggung tidak mendapatkan pasokan nourishment (nutrisi) secara optimum sehingga kemampuan dari piringan-piringan tadi menjadi berubah dan suatu saat dibebani dengan pekerjaan yang agak berat maka piringan-piringan tadi tidak sanggup dan menyebabkan nyeri. Dengan bersepeda akan dapat mengatasi masalah ini yaitu pertama, latihan fisik secara terus menerus yang akan membantu mengembalikan kemampuan discs berikut suplai “makanan” menjadi optimal kembali. Kedua, Otot besar pada punggung menjadi lebih kuat sehingga dapat membantu kerja tulang belakang. Jadi bersepeda juga dapat menstabilkan kinerja tulang punggung.
PERSAMBUNGAN LUTUT, penyebab umum terjadinya nyeri lutut biasanya karena kerusakan pada tulang
rawan/muda. Tekanan berlebihan yang terletak pada sambungan lutut, sebagai contoh:
dikarenakan jogging, atau terlalu gemuk, menghambat atau menolak pasokan nutrisi ke tulang rawan. Konsekuensinya tulang rawan menjadi lemah dan mulai rusak. Awal dari kerusakan/nyeri lutut saat dimana mineral-mineral berharga tidak bisa masuk ke tulang rawan. Semenjak tulang rawan tidak dialiri darah maka mineral-mineral berharga tidak bisa masuk ke tulang rawan. Pergerakan pada persambungan lutut dapat mendorong nutrisi kepada tulang rawan. Bersepeda adalah salah satu cara olah raga yang paling sedikit terjadi tekanan pada lutut dan cara yang paling baik untuk menguatkan tulang rawan.
JANTUNG DAN SISTEM CARDIOVASCULAR, Jantung adalah satu-satunya “motor” kita dan karena alasan itulah kita harus benar-benar merawatnya. Gejala stres dan mengerasnya arteri-arteri (arteriosclerosis) sebagai contoh, menyebabkan efek yang merusak pada jantung dan menghasilkan tekanan darah tinggi. Hal ini berakibat sesorang akan mengalami serangan jantung. Bersepeda akan memperbaiki sirkulasi darah secara keseluruhan. Yang terpenting adalah jantung akan bekerja lebih ekonomis karena performa pemompaan menjadi lebih efisien sehingga mengurangi tekanan darah secara keseluruhan dan mungarangi resiko penyakit jantung.
SISTEM KEKEBALAN, Infeksi adalah penyebab utama anda absen dari tempat kerja anda
. Satu dari beberapa alasan adalah kurang efektifnya kinerja sistem kekebalan tubuh yang menyebabkan reaksi alergi dan ketidakmampuan melawan flu dan demam. Bersepeda dapat meningkatkan kualitas sistem kekebalan dengan mengijinkan tubuh untuk melindungi dirinya dari virus dan bakteri. Bersepeda adalah metode olahraga yang paling banyak memiliki manfaat untuk menguatkan sistem kekebalan tubuh.
Sudah murah, bisa menghilangkan stress juga secara fisik membuat lebih sehat dan kuat.
Bagaimana? Masih ragu-ragu dengan bersepeda?
Tuesday, May 24, 2011
Tips menghindari lelah saat gowes ....
TIDAK NYAMAN KETIKA BERSEPEDA JARAK JAUH, INILAH PENYEBABNYA
Bersepeda dalam jarak yang relatif jauh (touring) tentunya sangat menyenangkan, apalagi dilakukan dalam kelompok yang besar, menyusuri lintasan yang baru tentu sangat menantang bagi para goweser.
Sering kali kita merasa tidak nyaman berada diatas sadle setelah menempuh jarak yang lumayan jauh, terlepas dari kondisi fisik goweser. Sebenarnya ada beberapa hal teknis yang patut diperhatikan sebelum kita merasa siap berlama-lama diatas sadle.
Apakah hal teknis yang menjadi perhatian agar kita merasa nyaman diatas sadle sepeda, yang paling pokok adalah “sepeda” itu sendiri. Frame sepeda, seperti yang pernah diulas diartikel-artikel sebelumnya, frame adalah heart of bike (jantungnya sepeda). Kesalahan dalam pemilihan ukuran frame berakibat fatal.
Goweser dapat melakukan sendiri pengukuran frame yang tepat, lebih sempurna lagi jika anda dibantu seorang teman, hanya bermodal alat ukur sederhana anda dapat menempukan ukuran frame yang pas dan tepat, kalkulator frame baik untuk roadbike maupun MTB dapat anda temukan di url berikut : http://www.competitivecyclist.com/za/CCY?PAGE=FIT_CALCULATOR_INTRO.
Mintalah bantuan teman untuk memperoleh posisi yang nyaman diatas sadle
Setelah dirasa frame sepeda anda sudah tepat dan pas, tapi masih sering merasakan sakit dibeberapa bagian tubuh, terutama ketika touring, mungkin setelan beberapa part seperti panjang stem, tinggi seatpost, dan yang lainnya adalah penyebabnya.
Meteran - alat sederhana yang sangat membantu bike fitting
Kali ini zonasepeda memberikan tips trik dan solusi untuk menelurusi penyebab tidak nyamannya goweser ketika berada diatas sepeda.
1. Gejala : Anda selalu bergeser ke depan ketika berada diatas sadle.
Kemungkinan Penyebab :
- Stem mungkin terlalu panjang, sehingga anda harus menarik diri kedepan untuk menjangkau handlebar.
- Posisi hidung sadle terlalu naik (berlebihan).
- Posisi Sadle terlalu kebelakang diatas rel sadle seatpost.
Solusi :
- Memasang stem dengan ukuran yang lebih pendek
- Atur posisi naik turun sadle sehingga terposisi vertikal sempurna, anda dapet menggunakan waterpass atau alat ukur sejenis untuk melakukannya.
- Atur posisi maju-mundur sadle sehingga diperoleh posisi yang nyaman.
waterpas - membantu mendapatkan posisi sempurna naik-turun sadle
2. Gejala : Anda selelu bergeser ke belakang ketika berada diatas saddle, ini merupakan kebalikan dari gejala no.1
Kemungkinan Penyebab :
- Stem terlalu pendek, sehingga posisi badan terasa terlalu dekat dengan handlebar.
- Posisi hidung sadle yang terlalu turun (menukik).
Solusi :
- Cobalah untuk menggunakan stem dengan ukuran yang lebih panjang.
- Atur posisi naik turun sadle sehingga terposisi vertikal sempurna, anda dapet menggunakan waterpass atau alat ukur sejenis untuk melakukannya.
- Atur posisi maju-mundur sadle sehingga diperoleh posisi yang nyaman.
3. Gejala : Anda merasa sakit pada bagian punggung bagian bawah.
Kemungkinan Penyebab :
- Posisi Stem yang terlalu pendek atau Ukuran stem yang terlau panjang. Anda sering melakukan perenggangan badan, karena posisi anda yang terlalu menunduk.
- Posisi Seatpost yang terlalu tinggi hal ini menyebabkan posisi badan terlalu menunduk dan pinggul bergoyang secara berlebihan.
Solusi :
- Tambahlah spacer, sehingga stem dapat naik. Jika dirasa masih kurang naik, gunakanlah stem dengan bentuk yang agak serong naik (banyak dijual di pasaran).
- Cobalah ukuran stem yang lebih pendek.
- Aturlah tinggi-rendah seatpost hingga diperoleh posisi yang tepat.
4. Gejala : Bagian Leher anda sering sakit
Kemungkinan Penyebab :
- Posisi Stem yang terlalu rendah, hingga anda harus terlalu mendongak untuk melihat jalan.
Solusi :
- Tambahlah spacer, sehingga stem dapat naik. Jika dirasa masih kurang naik, gunakanlah stem dengan bentuk yang agak serong naik (banyak dijual di pasaran).
5. Gejala : Lengan tangan terasa sakit.
Kemungkinan Penyebab :
- Posisi Stem yang terlalu rendah, sehingga terlalu banyak beban tubuh yang ditahan oleh lengan.
- Hidung Sadle terlalu menukik ke bawah.
Solusi :
- Tambahlah spacer, sehingga stem dapat naik. Jika dirasa masih kurang naik, gunakanlah stem dengan bentuk yang agak serong naik (banyak dijual di pasaran).
- Atur posisi naik turun sadle sehingga terposisi vertikal sempurna, anda dapet menggunakan waterpass atau alat ukur sejenis untuk melakukannya.
Gunakan Pendulum atau sejenisnya untuk menentukan maju-mundur sadle
6. Gejala : Lutut bagian depan terasa sakit.
Kemungkinan Penyebab :
- Posisi seat post yang terlalu rendah atau posisi sadle yang terlalu maju kedepan. Hal ini menyebkan lutut bagian depan anda bekerja berlebihan.
Solusi :
- Aturlah tinggi-rendah seatpost hingga diperoleh posisi yang tepat.
- Atur posisi maju-mundur sadle sehingga diperoleh posisi yang nyaman.
7. Gejala : Lutut bagian belakang terasa sakit.
Kemungkinan Penyebab :
- Posisi seat post yang terlalu tinggi, hal ini menyebabkan kaki anda bersusah payang meriah pedal.
Solusi :
- Aturlah tinggi-rendah seatpost hingga diperoleh posisi yang tepat.
8. Gejala : Pantat tersasa panas dan sakit.
Kemungkinan Penyebab :
- Terlalu banyak beban tubuh pada sadle, tidak menggunakan celana khusus bersepeda.
Solusi :
- Posisikan handlebar agak rendah, sehingga beban pada sadle tidak berlebihan.
- Cek kembali tinggi seatpost, mungkin terlalu rendah hingga sadle tidak maksimal menyangga berat badan.
- Gunakan celana khusus bersepeda.
9. Tendon Achilles terasa sakit (jari kaki).
Kemungkinan Penyebab :
- Mengayuh pedal terlalu berlebihan pada bagian jari-jari kaki, posisi cleat pada sepatu bersepeda anda terlalu jauh kedepan.
Solusi :
- Posisikan pedal tepat diantara tapak kaki dan jari kaki, jaga bola kaki anda saat mengayuh.
Demikianlah 9 uraian singkat mengenai beberapa keluhan dan kendala yang ditemukan ketika goweser melakukan touring.
Tips : usahakan selalu melakukan pemanasan ringan sebelum bersepeda. Happy cycling dan Keep Goweeessssss….
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