The SES 2.3 is purpose-built for the mountains. Ultra-light, respectfully aerodynamic, and optimized for tubeless tires, the SES 2.3 raises the bar for performance through hilly and mountainous terrain.NOT FOR OFF-ROAD/GRAVEL USE! INNERDRIVE premium disc road hub Centerlock only (lockrings not included) 1274-gram wheelset weight (+/- 2%) Inner rim width: 21mm Minimum labeled tire size: 25mm For use with tubeless tires only