Luft Fusion air spring for Fox and Rockshox forks

The Luft Fusion air spring is the final stage in the evolution of air forks.

Current stock forks suffer from an excessively small negative chamber due to dimensional limitations. That is equivalent to a 75kg rider with a coil spring that starts at 100kg, drops to 50kg in the middle of the travel then ramps up to 100 a the end.

The particular architecture of the Luft Fusion overcomes the limits of the traditional design. 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. I't like a progressive coil spring, but tunable and lightweight like air. The best of both worlds.

In practice:
+ predictability and intuitivity thanks to a constant spring rate in the first 2/3 of travel
+ 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
+ no need for advanced damper tuning. The air spring does what it should; you can set the damper to your needs without compromises.


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 30% more air pressure.

Air springs are currently available for the following models:
Rockshox Pike 2018+, Revelation 2018+
Rockshox Lyrik, Yari 2022-
Rockshox Lyrik 2023+
Rockshox ZEB
Rockshox Boxxer 2019-2022 (35mm)
Fox 34 2016-2021
Fox 34 2022+
Fox 36 2018-20
Fox 36 2021+
Fox 36 Rythm 2019-2023, Marzocchi Z1
Fox 38
Fox 40 2016+

The price includes EU,UK shipping. For other countries please contact me.

Owners of Fox forks with GRIP and GRIP2 dampers can also choose to have it tuned.
The tuning consists in internal modifications aimed at improving response to fast impacts, removing harshness and allowing to use more LSC and HSC for support while retaining sensitivity and comfort. For GRIP dampers, the compression valving is also modified with an internally fixed low speed bleed and customized high speed stack that allow the damper to work with minimal compression preload, performing similarly to GRIP2 dampers.
Lower legs bushing are checked and if necessary calibrated. The Luft Fusion air spring is installed.
This service is available for an additional 120€. Turnaround time is 5-7 days in EU.


If you have any questions just ask.

Forum thread:
https :///forum/t/luft-fusion-tuning-luftkammer.959439/