Fox suspension float k ctd trek rear shockthe fox suspension float k ctd trek rear shock features foxs ctd climbtraildescend system that makes it easy to set up your fork and shock to work together for unprecedented performance in all types of terrain the fox suspension float k ctd trek rear shock has a tune that has been specifically optimised for use on trek bikes features lever actuated climbtraildescend compression settings anodised air sleeve and body trek bikes optimised tune adjus