The newest version of FOX's renowned lightweight shocks to fit deep snow rear suspensions.The center shock features QS3 three position adjustment for quick, easy compression and rebound adjustments, the rear features QS3 compression adjustment plus a lockout feature. FEATURES: Optimized lightweight spring & shock design. FOX ice scraper technology (FIST). One-piece, aluminum mounting hardware. High-flow velocity-sensitive damping. Internal groove position sensitive technology. Fully rebuildable and re-tuneable. Fits 146" - 165" track lengths. - REV Gen4 Summit & Freeride 146", 154", 165" with tMotion