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