Adjustable length for versatility: The bicycle trainer axle features an adjustable length with spacers that accommodate thru axle hubs from 135 mm to 148 mm and fit bike frames up to 176 mm wide, providing compatibility across different models. Stable training experience: Tapered heads on both ends create a secure engagement with most trainer mounting holes, reducing slippage and delivering stable performance during workouts. Aluminum alloy build: Made from 6061 aluminum alloy for longlasting strength, designed to endure regular use without compromising rigidity or reliability. Enhanced frame protection: Tailored spacers fit snugly into the dropout shape to protect your frame from potential damage during intense training sessions. Use scenarios Switch between bikes with 135148 mm thruaxles: Ideal for households or workshops that use multiple bikes on a single trainer, ensuring quick, secure setup across models. intensity training with confidence: The tapered heads and secure spacers minimize movement and slippage, supporting demanding workouts while protecting frame integrity. Family or use with diverse frames: The adjustable length and spacers accommodate a range of frames up to 176 mm wide, enabling convenient use with different bicycle setups without accessories changes.