For the first time, we created an air spring with a truly better spring rate, everywhere in the travel, than a coil. The Secus upgrade delivers the first and only air spring system to really come indistinguishably close to the linear spring rate of a coil fork for the entire first 2/3rds of its travel, with the advantage of a gentle end stroke progression to prevent bottoming without the wall of force harshness that excessively progressive springs create.
Fox A1 : Fox 36
Fox A2 : Fox 38
Fox A3 : Fox 40 - includes the F40 piston
RockShox A3 : Lyrik, Zeb, Boxxer 35
RockShox A4 : Boxxer 38mm (non linear XL)
Secus Features
- Superior small bump compliance from enlarged negative chamber
- Experience enhanced support and predictability with our proprietary Midstroke Support Valve
- Coil-like plushness and predictability, with air spring bottomlessness
- Enables full use of travel in both directions
- Enhances lubrication with increased lower leg oil volume
- Lightweight at just 130g
- Effortless setup -add air, bounce on it, press MSV charge button, ride
- Compatible with OEM volume spacers
- More consistent spring rate
- Transfer between compatible forks with just a footstud change
Three Stages of Control
Optimizing the start, middle, and end segments of the stroke, the Secus provides a spring rate that combines linearity and progression, surpassing the capabilities of coil springs and traditional air springs.
Initial stroke - enlarged negative air spring chamber delivers a soft, supple initial stroke for ultimate small bump compliance
Midstroke - where traditional air spring rates drop off in the midstroke, our proprietary Midstroke Support Valve technology boosts the midstroke spring rate to maintain linearity, for support, predictability, ride height and compliance
End stroke - enlarged lower leg volume reduces overall progression even at higher pressures and allows for a wider range of end-stroke ramp options to be utilised with standard fork volume spacers.
