Versatile and reliable bike trainer axle designed to fit a wide range of thru axle standards with built in protection for your frame. Key benefits Versatile compatibility Adjustable length with spacers to accommodate thru axle hubs of 135x12, 142x12, and 148x12. Fits bike frames up to 176 mm wide, enabling seamless use across a variety of bike models. Secure and slippage Tapered heads on both ends fit most bike trainer mounting holes securely, providing a reliable connection during training and reducing the risk of slippage. Strong and precise Made from 6061 aluminum alloy for strength and accuracy. Robust construction stands up to rigorous use while maintaining integrity. Enhanced frame protection Includes MTB Road Bike Thru Axle Spacers tailored to match the shape of frame dropouts, offering additional protection to safeguard the bike frame during intense sessions. Use scenarios Scenario 1: Mixed bike fleet setup You ride road, gravel, and MTB bikes that use different thruaxle standards. This axle allows adjustment with spacers to fit 135x12, 142x12, or 148x12 hubs and frames up to 176 mm wide, enabling quick, secure trainer mounting across models without swapping hardware. Scenario 2: Regular trainer use with multiple bikes For frequent training with different bikes, the tapered heads on both ends ensure a secure fit to most trainer mounting holes, reducing setup time and avoiding slippage during sprints or steadystate efforts. Scenario 3: intensity training with frame protection During intense workouts, the included spacers match the dropout shape to provide additional protection for the frame, helping prevent dropout damage while maintaining stable trainer performance.