RockShox SIDLuxe Ultimate Rear Shock - 190 x 45 mm, DebonAir, 1 Token, Reb85/Comp33, L/O8, 2P Remote, Standard, A2, Trek TopFuel 2020-2022Blistering sprints, chunky descents, and high speed singletrackSIDLuxe Ultimate is built for this. Its two position (2P) XC damping gives you a rock solid Lock position for starts and sprints as well as an Open position with lighter compression damping for punishing downhills. SIDLuxe is the only super light rear shock that can go toe to toe with your favorite SID fork. FEATURES NEW High speed compression damping blow off for Open position. NEW