For the first time, Vorsprung has 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 single crown 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.

This version of the Secus fits Fox 40 mm stanchioned forks (see Compatibility info).  Also available for RockShox, Fox 32/34/36/38 mm & Marzocchi forks.
Learn More

Secus Fox A3 foot stud to fit a Secus to Fox 40 mm stanchioned forks
This kit includes the same foot stud as the one in the Fox A1 kit, but includes a replacement air piston for the Fox 40 Learn More

Air piston removal tool for Fox 40 mm forks
For use in installation of Vorsprung Secus Learn More