WHL RR 29 WTB SX23 DISC BK 32 M525 BK 135mm DTI2.0BK Review Posted: August 02, 2018 Under: Bike Wheels By ChillyBoulder no Comments 29in Wheel Size Rim Model: WTB SX23 Disc Hub Model: Shi M525A QR Freehub Body (rear wheels only): 8-10s Cass Rotor Mount (disc wheels only): 6B WHL RR 29 WTB SX23 DISC BK 32 M525 BK 135mm DTI2.0BK