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Sabtu, 17 Agustus 2013

Fork Sepeda Gunung... Maksudnya ?

Fork atau Garpu Sepeda Gunung Mtb adalah sebuah alat yang terlihat seperti sebuah garpu raksasa dan terletak di bagian depan sepeda gunung. Garpu atau Fork ini mengapit Roda Depan sepeda gunung. Umumnya Fork sepeda gunung itu ber-suspensi.
Suspensi Fork ada tipe sbb:
1. Fork Coil atau Per atau Spring saja.
2. Fork Angin atau Air suspension fork, 1-tabung hydraulic dan yang 1-tabung lagi Coil atau Per-Spring.

Perbedaaan Macam-macam Kelas Fork Sepeda mtb gunung adalah sbb:
1. Fork sepeda gunung XC-Cross-Country, biasanya tavel 80-100-120
2. Fork sepeda gunung DJ-Dirt-Jump, biasanya travel 100
3. For sepeda gunung AM-All-Mountain, biasanya travel 120-140-160
4. Fork sepeda gunung FR-Free-Ride, biasanya travel 180-200
5. Fork sepeda gunung DH-Down-Hill, biasanya travel 180-200






Lagi HUNTING FORK atau REARSHOCK yah ?  Cekidot saja di Link di Bawah ini yah: 

HARGA PROMO FORK dan REARSHOCK di Toko Sepeda Online Majuroyal Bike


LINK TERKAIT: Fork-fork sepeda mtb Terlaris 

Jual Fork Suntour Epicon

Jual Fork Xfusion 

Jual Fork Fox

Jual Fork Rst


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TESTIMONIAL Customer lihat di sini...  http://majuroyalbikes.com/?page_id=617  

upgrade your fork now...

Contoh Review sebuah Fork Air yg kami dapat by Searching di Google, sbb:

       The Rock Shox Recon Gold series is the top fork in the Recon range and delivers straightforward, simple to tune and reliably consistent control in a usefully light package for the price.
Power Bulge and post-style brake mount lowers, plus a reworked crown/stanchion interface remove previous stiction/spiking issues and leave a light chassis that steers okay and stops smoothly, even in quick-
release format. There’s no 15mm through-axle option though and you get the older zip tie rather than triangular clamp hose guide.

The air spring is Rock Shox's simpler Solo Air system. This removes the precarious pressure balancing of Dual Air and makes setup a lot simpler. It’s still sensitive enough over small stuff once bedded in. An external rebound adjuster and low speed/lockout lever cover the basic bounce control options well.
The Motion Control valving only really gets overwhelmed on larger successive strikes such as steps or long rocky descents. The internals are totally proven and come with a great reliability reputation however hard you treat them. Spare seals, pump and stickers are included with the fork too. 100mm and coil sprung options are also available.
This article was originally published in What Mountain Bike magazine and Bikeradar.com


      The Fox 36 Float fork has been a staple of mountain biking for some time now, and this latest tapered-steerer incarnation improves on what was already a great 160mm-travel (6.3in) performer. There's more than enough adjustment to help get your money's worth here, including low-speed compression, lever-actuated lockout with a lockout force adjuster, rebound, and air spring pressure. After an extensive chat with suspension fettlers Mojo, we found a decent base setting that produced a stable ride both on the ups and downs, and only ever tweaked the rebound a little when out in the Alps and dealing with bigger, faster hits. It's clear the push to reduce friction using the Kashima-coated stanchions and new SKF seals has really paid off – the beginning of the fork's stroke is far more supple now. We've fans of the FIT damper for some time now and it feels better than ever, offering efficiency, stability and support where others can falter.

The smoother stroke means grip and comfort are improved which is certainly apparent over longer, more tiring descents. At speed, there was little that could trip this fork up and it handled the roughest rides ridiculously well time after time, tackling some of the ugliest terrain with control and composure. This article was originally published in Mountain Biking UK magazine and Bikeradar.com  


Contoh Gambar anatomi fork Air ini kami dapat dari Searching di Google 


Suspension fork design has advanced in recent years with suspension forks becoming increasingly sophisticated and diverse in design. The amount of suspension travel available has increased over time. When suspension forks were introduced, 80–100 mm of travel was deemed sufficient for a downhill mountain bike. Typically this amount of travel is now used in XC disciplines, with downhill forks now offering 150 to 200 mm of travel for handling extreme terrain. This is not the limit of suspension fork travel; for example, the Marzocchi Super Monster T offers 300 mm (12 inches) of travel.[8]

Other advances in design include adjustable travel allowing riders to adapt the fork's travel to the specific terrain profile. Typically, less suspension travel is needed for uphill or flat terrain than for downhill terrain. Advanced designs also often feature the ability to lock out the fork to eliminate or drastically reduce the fork's travel for more efficient riding over smooth sections of terrain. This lockout can sometimes be activated remotely by a cable and lever on the handlebars.

The shock absorber usually consists of two parts: a spring and a damper or dashpot. The spring may be implemented with a steel or titanium coil, an elastomer, or even compressed air. The choice of spring material has a fundamental effect on the characteristics of the fork as a whole. Coil spring forks are often heavier than designs which use compressed air springs, but they are more easily designed to exhibit a linear, Hookean response throughout their travel. Replacing steel coils with titanium coils in a design can decrease the weight of the design but leads to an increase in expense. Air springs utilize the thermodynamic property of gases that their pressures increase as they are compressed adiabatically. As the "spring" is provided by air rather than a coil of metal, forks with air springs are often lighter. This makes their use more common in XC designs. Another advantage of this type of fork design is that the spring constant can be adjusted by adjusting the air pressure. This allows a fork to be tuned to a rider's weight. One disadvantage of this design is the difficulty in achieving a linear response, as pressure varies approximately inversely (not linearly) with volume in a gas. As the fork compresses, the effective spring constant of the fork increases. Increasing the volume of the air inside the spring can reduce this effect, but the volume of the spring is ultimately limited, as it needs to be contained within the dimension of the fork blade.

The damper usually forces oil to pass through one or more small openings or shim stacks in the suspension fork. On some models, the spring, the damper, or both may be adjusted for rider weight, riding style, terrain, or any combination of these or other factors. The two components may be separated with the spring mechanism in one blade and the damper in the other.
Forks have several key dimensions which include: offset, length, width, steerer tube length, and steerer tube diameter.
Offset

Bicycle forks usually have an offset, or rake (not to be confused with a different use of the word rake in the motorcycle world),[1] that places the fork ends forward of the steering axis. This is achieved by curving the blades forward, angling straight blades forward, or by placing the fork ends forward of the centerline of the blades. The latter is used in suspension forks that must have straight blades in order for the suspension mechanism to work. Curved fork blades can also provide some shock absorption.

The purpose of this offset is to reduce 'trail', the distance that the front wheel ground contact point trails behind the point where the steering axis intersects the ground. Too much trail makes a bicycle feel difficult to turn.

Road racing bicycle forks have an offset of 40-45mm.[2] For touring bicycles and other designs, the frame's head angle and wheel size must be taken into account when determining offset, and there is a narrow range of acceptable offsets to give good handling characteristics. The general rule is that a slacker head angle requires a fork with more offset, and small wheels require less offset than large wheels.

Fork offset influences geometric trail, which affects a bicycle's handling characteristics. Increasing offset results in decreased trail, while decreasing offset results in increased trail.
Length

The length of the fork is usually measured parallel to the steerer tube from the bottom of the lower bearing race to the center of the front wheel axle.[3] A 1996 survey of 13 700c road forks found a maximum length of 374.7 mm and a minimum of 363.5 mm.
Width

The width of the fork, also called spacing, is measured colinear with the front wheel axle between the inside edges of the two fork ends. Most modern adult sized forks have 100 mm spacing.[4]Downhill mountain bike forks designed for through axles have 110 mm spacing.[4]
Steerer tube length

The steerer tube is sized either to just accommodate the headset bearings, in the case of a threaded headset, or to contribute to the desired handlebar height, in the case of a threadless headset.
Steerer tube diameter

When sizing a fork to a frame, the diameter of the fork steerer or steer tube (1" or 1⅛" or 1½") must not be larger than that of the frame, and the length of the steerer tube should be greater than but approximately equal to the head tube length plus the stack height of the headset. Adapter kits are available to enable use of a 1" fork in a frame designed for a 1⅛" steer tube or a 1⅛" fork in a 1½" frame.

Tapered steerer tubes: As of 2008 a number of manufacturers of high end road and mountain bikes are coming out with tapered steerer tubes. While there are purported advantages, there are not any standards yet developed, with each manufacturer following its own conventions. This makes replacement parts difficult to come by, only available from the original manufacturer.[5]
General sizing issues

The blades must be the proper length to both accommodate the desired wheel and have the correct amount of rake to provide the approximate steering geometry intended by the frame designer. The functional length of the fork is typically expressed in terms of Axle-to-Crown race length (A-C). Also, the axle on the wheel must fit in the fork ends (usually either a 9mm solid or hollow axle, or a 20mm thru-axle). Some manufacturers have introduced forks and matching hubs with proprietary standards, such as Maverick's 24mm axle, Specialized 25mm thru-axle and Cannondale's Lefty system.
Threading

Fork steerer tubes may be threaded or unthreaded, depending on the headset used to attach the fork to the rest of the bicycle frame. An unthreaded steel steerer tube may be threaded with an appropriate die if necessary. The thread pitch is usually 24 threads per inch except for some old Raleighs which use 26.[6]

SUMBER bacaan dari Wikipedia

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