When you ride the SID Ultimate, you’ll notice that we’ve considered every detail. A completely new chassis and the also new, lightest Charger Race Day damping are a perfect match. Perfectly tuned for the speed needs in cross-country. A new 35 mm chassis is the ideal blend of low weight and stiffness for modern XC bikes. The new Charger Race Day cartridge – our lightest production shock with full lock-out.