Enduro Max Cartridge bearing 6806 2RS 30X42X7mm For BB30 - Suitable for Tacx trainers with rear-wheel drive only - 01: T1706 E-Thru trainer axle M10x1 with metric fine thread. For hubs with axle skewer attachment 135×10mm: various Swiss and Shimano. Length: 162.5mm - 02: T1707 E-Thru trainer axle M12x1 with metric fine thread. For hubs with axle skewer attachment 142×12mm: various DT Swiss and Shimano. Length: 162.5mm - 03: T1709 E-Thru adapter X-12 (>142 mm) - 04: T1711 E-Thru trainer axle M12x1 with metric fine thread. For hubs with axle skewer attachment 142×12mm: DT Swiss RWS axle skewer (conical and flat) Syntace X-12 system (Specialized) and various Shimano. Length: 175mm - 05: T1710 E-Thru trainer axle M12x1.5 with medium thread. For hubs with axle skewer attachment 142×12 including Shimano SM-AX65 SM-AX75 SM-AX76 and SM-AX78. Length: 162.5mm - 06: T1708 E-Thru trainer axle M12x1.75 with standard threaded cartridge. For hubs with a Maxle axle skewer attachment 135×12 142×12 150×12 mm and Trek ABP 142×1. Length: 179.5mm