Tacx Trainer Axle M12*1 for E-Thru E-Thru axle skewers allow you to put your mountain bike in the TacxR trainer. Axles are only compatible with Tacx classic trainers and not for use on direct drive trainers. T1711 E-Thru trainer axle M12*1, with metric fine thread Suitable for hubs with axle skewer attachment 142*12mm: DT Swiss RWS axle skewer (conical and flat), Syntace X-12 system (Specialized) and various Shimano types