Last year Fox introduced a completely revised 36 series of forks that were lighter and more supple than anything else in their lineup. An important part of that trail taming recipe was a move to a new air spring system, which eliminated the use of a coil in the negative spring.
In addition to helping shave almost a quarter pound, the new design (which they’re now calling FIT4, for fourth generation Fox Isolated Technology) provided a more consistent feel. Rather than having to pick a coil spring rate to accommodate a wide variety of riders, they borrowed from a designed first introduced in their 1999 Float Shock, to automatically equalize the air in the negative chamber when the fork was deep into it’s compression stroke. This technology also meant that Fox could introduce volume spacers to tune the progressiveness of the air spring. (You can read more about the new Float air spring here, and check out our Suspension Setup Series to learn more in general.)
Due to the drastic drop in weight and incredible gains in performance, it was only a matter of time before Fox took this technology down market to its 34 series of trail oriented forks. As such, Fox claims the new 34 is the “little brother to the 36″ and is aimed at aggressive trail riders looking for a super lightweight package.