TheTacx Trainer Axle for E-Thru 12mm Rear Wheelis designed for use with any Tacx turbo trainer, allowing riders with 12mm E-Thru axles to benefit from the revolutionary indoor trainers from Tacx.E-Thru trainer axle M12x1, with metric fine thread - suitable for hubs with axle skewer attachment 142 × 12 mm: various DT Swiss and Shimano types.