The Luft Fusion air spring is the final stage in the evolution of air forks.
Thanks to its particular architecture the negative chamber is about double the size than stock air forks and the positive chamber is increased by about the equivalent of 1-2 tokens; the lower leg volume is unchanged.
This results in a perfectly linear spring curve in the first 2/3 of travel, then becomes progressive in the last part. The end stroke progression is tunable with the original tokens. It has no preload at full extension, unlike the Debonair C1.
In practice: + more suppleness at the beginning of the stroke -> more traction (especially on low-grip surfaces) and comfort + more supported in the mid-stroke -> less diving under braking and on steeps, even with less compression damping! + thanks to the enlarged positive chamber it's possible to have less end-stroke progression, allowing even lighter riders to achieve full travel + predictability and intuitivity thanks to a constant spring rate in the first 2/3 of travel
The comparison charts show clearly the improvements, in particular the "spring rate": no fork manifacturer has ever shown theirs, and now you know why! A constant spring rate, such as on a coil fork, makes the fork intuitive and predictable, leaving the rider free to focus 100% on the trail instead of having to adapt his riding style (and damper settings) to overcome the shortcomings of the spring.
In short, it combines all the pros of coil and air, without any of the cons. Better than air. Better than coil.
The system uses a positive and a negative chamber, self equalizing, and replaces the lower air shaft only, keeping the original upper cap and valve (and tokens). There are no special valves, floating pistons, etc. that can fail or leak. Only one extra seal (static) compared to a standard air spring. No need for external air tanks, dual positive chambers, dual crowns (or 1,5 crowns). It requires about 60% more air pressure, and adds only 60gr.
Air springs are currently available for the following models: - Rockshox Lyrik, YariI A1+ (2016+) Pike B1+/Revelation A1+ (2018+) 150-180mm - Rockshox Zeb: 150-180mm (+20€) - Fox 36: [2018-2021] 160-170mm (+20€)
The price includes EU,UK shipping. For other countries please contact me.