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Older models were coil or air with or without U-Turn. 2014 onwards are Solo-Air, Dual Position Air, or Debonair. Pilot 2003 2005 28 mm 80/100 mm Reba 2005 Present 32 mm 80/100/120 mm Dual Air, 90–120 mm Air U-Turn, 130/140 mm Trail Specific 29" Dual Air, Air U-Turn, Trail Specific 29", Solo Air (since 2013) Recon 2006 Present 32 mm
2021 Pike, Lyrik, Yari, and Revelation get an updated spring tune, and it’s backward compatible with many existing RockShox forks.
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.
However air pressure naturally controls both spring rate and preload at the same time, requiring air forks to have additional systems to adjust preload separately, adding to its complexity. Another disadvantage of air-sprung forks is the difficulty in achieving a linear spring rate throughout the fork's action.
PDF (Posi Damp Fork): This was fitted to the Suzuki RG500, the GSX1100E/GS1150E and GSX-R 750 and was an enhancement of the previous Anti Dive units (which works by brake fluid pressure closing a valve in the mechanism when the brakes are applied, restricting the flow of damping oil and slowing fork compression).
The Earles fork is a variety of leading link fork where the pivot point is behind the front wheel, which is the basis of the Earles' patent. [3] Patented by Englishman Ernest Earles in 1953, the design is constructed of light tubing, with conventional 'shock absorbers' mounted near the front axle.