With the E-Thru axle skewer you use an axle skewer to put your mountain bike in the Tacx trainer. These axles are only suitable for the Tacx classic trainers. Separate axles are available for direct drive trainers, and replace the standard axle skewer.
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Garmin Tacx Trainer Axle E-Thru M12x1.5 for 142x12mm axle T1710