Versatile compatibility Designed to fit multiple bike types with adjustable length and spacers, this hub axle accommodates thru axle hubs of 135, 142, 148 mm and 12 mm. The trainer thru axle can be used with frames up to 176 mm in width, making it suitable for a range of models. Whether you ride a mountain bike or a road bike, this trainer axle skewer integrates with your setup and lets you switch between bicycles without additional adapters. Secure connection design Tapered heads on both ends create a stable, reliable connection with most trainer mounting holes. The design prevents slippage during intense training, allowing you to focus on your workout rather than worrying about stability. The strong grip maintains position during standing pedaling or interval work on your indoor trainer. aluminum construction Made from 6061 aluminum alloy, this bicycle hub axle offers strength without unnecessary weight. Precisionmachined threads are available in P1.0, P1.5, and P1.75 options for smooth installation and removal while maintaining structural integrity over repeated use. The combination of lightweight design and solid loadbearing capacity makes it a dependable component for your indoor training setup. Enhanced frame protection The included MTB Road Bike Thru Axle Spacers are designed to match the shape of frame dropouts, providing protection for your bike frame. By distributing pressure evenly at contact points, they help preserve frame integrity during intensive training while ensuring a secure connection for effective indoor workouts. Usage scenarios You own both a mountain bike and a road bike and want to use a single trainer axle without swapping adapters. The adjustable length and spacers cover 135, 142, 148 mm hubs and 12 mm through axles, for frames up to 176 mm wide. You train on a trainer with different dropout geometries. The tapered heads and secure grip keep the axle stable during sprints and standing pedaling. You value frame protection during intense intervals. The included spacers distribute pressure evenly to minimize stress on frame dropouts while maintaining a solid connection.