1. Wide compatibility for training needs This bike trainer axle offers adjustable length with spacers to accommodate thruaxle hubs from 135 mm to 148 mm, and is compatible with bike frames up to 176 mm wide for extensive usability across models. 2. Reliable connection design Featuring tapered heads on both ends for a secure fit in most bike trainer mounting holes, this axle minimizes the risk of slippage while you train. 3. strength aluminum alloy construction Made from 6061 aluminum alloy, this hub axle is engineered to withstand the rigors of intense training without compromising structural integrity. 4. Protective spacer design The MT B throughaxle spacers conform to the shape of frame dropouts, adding protection against damage during energy workouts. Use scenarios Scenario 1: You train with multiple bikes that use different thruaxle standards. This axle, with adjustable length and spacers, lets you switch quickly between 135 mm and 148 mm hubs on frames up to 176 mm wide, keeping your trainer setup simple and reliable. Scenario 2: You regularly switch between road and MTB frames on the same trainer. The tapered end design ensures a secure, slippage connection across a variety of mounting holes, reducing setup time and downtime. Scenario 3: You perform intensity intervals and hard efforts. The spacer design protects frame dropouts by matching their shape, helping to prevent dropout wear or damage during demanding workouts.