WTB CZR i30 Rear Wheel - 29", 12 x 148mm, 6-Bolt, Black, XDR, 28HCZR i30 wheels were designed to handle it all. The rims are made with a strategically reinforced carbon layup that and are hand built using double butted spokes and brass nipples, featuring hubs with top tier bearings and oversized freehub seals to establish themselves as wheels that simply won't quit. CZR i30 Carbon Rim with 5mm of asymmetrical spoke offset, reinforced spoke beds and hookless bead, TCS Tubeless compatible Enduro approved rim is