When every gram counts, we go with the Roval Control SL Series for race-worthy components that are quality-made. The Roval Control SL Stem follows suit and is a lightweight aluminum stem designed to be paired with the Control SL Handlebar for a lightweight, cross-country pairing. Titanium bolts help save weight and are super durable, and a 35mm clamp diameter makes for a stiffer cockpit for maximum efficiency and control.