Wide compatibility for training needs The bike trainer axle is adjustable with spacers to fit thruaxle hubs from 135 mm to 148 mm, and it supports bike frames up to 176 mm wide. This provides broad usability across multiple models and configurations. Reliable connection design Tapered heads on both ends create a secure fit in most trainer mounting holes, reducing the risk of slippage during training sessions and helping maintain consistent performance. strength aluminum alloy material Manufactured from 6061 aluminum alloy, this hub axle is built to endure intense training without compromising structural integrity or durability. Protective spacer design The MTB road bike thruaxle spacers are shaped to match the frame dropout areas, offering additional protection against dropout damage during energy workouts. Use scenarios Multibike home gym setup: Easily switch between road and mountain bikes on a single trainer by adjusting length with spacers to accommodate different thruaxle widths. intensity intervals: Secure, stable mounting prevents slippage during powerful efforts and sprints. Frame dropout protection: Spacer design conforms to dropout shapes, helping protect frames during aggressive training sessions.