Blistering sprints, chunky descents, and high-speed singletrack—SIDLuxe 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.