Zipp 30 Course Rim-Brake Tubular rear wheel - Shimano/Sram - Black/WhiteSpecifications:- Max. recommended rider weight: 250 lbs/133 kg- Suitable for: Only SRAM XD 11-Speed MTB cassettes- Weight : approx. 835 gr.- ERD (Effective rim diameter): 586 mm- Hub Used : 177- Rim Depth : 26 mm- Max Width : 25 mm- Spokes : Sapim® CX-Ray- Spoke Count : 24- Spoke Length Non-Drive : 292 mm- Spoke Pattern Non-Drive : 2-Cross- Spoke Length Drive: 290 mm- Max Tire Pressure : 125 PSI- Max Tire Pressure : 8.62 Bar- 11-speed compatible hub : Yes- Dimpled Surface : No- Nipples : Sapim® Secure Lock- External Nipples : Yes- XDR Driver Body compatible: Yes