A long time favorite for people who like to go fast on pavement, the Rail is our wind cheating rim brake wheel. It's 55mm deep, 18mm internal/25mm external wide, tubeless ready, and has a grooved brake track for better braking. Still phenomenally manageable in cross winds. Ideally paired with a true 25mm tire (GP5000 25, Pro One 25) for best aerodynamics and rolling resistance balance, but works great with anything from 23mm to 35mm. Carbon-specific brake pads included. Carbon rim brake braking has come a long way in the past decade, and Rails will provide excellent all conditions braking in "normal" flat to rolling terrain. We do not recommend Rails or any other carbon clinchers for use in mountainous territory with continuous demand for heavy braking.