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The Garmin Tacx E-Thru Trainer Axles for Classic Trainers are designed to let you use your modern thru-axle bike with a traditional Tacx wheel-on trainer. Many newer road, gravel, and mountain bikes come equipped with thru-axle dropouts, which are not directly compatible with older quick-release style trainers. These dedicated E-Thru trainer axles replace your existing rear axle and provide the correct interface and spacing so your frame sits securely and safely in the trainer.
Engineered specifically for indoor training, these axles are built to handle the repeated clamping forces and lateral loads that occur during intense workouts and sprints. Installation is straightforward: simply swap out your standard thru-axle for the Tacx E-Thru version that matches your bike’s thread and length standard, then mount the bike in your classic trainer as usual. By using the correct trainer-specific axle, you help protect your frame, improve stability, and ensure a more realistic and confidence-inspiring ride feel during every indoor session.
