Protects the bicycle frame from potential damage during trainer use by providing stable, aligned mounting and load distribution. Length is adjustable with shims, allowing a precise fit for different frame spacings and trainer configurations. Quickrelease axles are available in multiple sizes to fit a range of bicycle models; axles have tapered heads at both ends for secure seating and easy installation. Compatible with road, mountain, and hybrid bikes through adjustable length and multiple axle sizes, delivering reliable performance across different setups. Use scenarios Home gym with multiple bikes: switch between road and mountain bikes quickly by adjusting length with shims and changing to the appropriate quickrelease axle. Bike or shared gym: service different models efficiently, reducing downtime when customers bring in various frame types thanks to multiple axle sizes and easy installation. Training on the go or in a studio: adapt to different bikes and trainer configurations with minimal setup time, ensuring consistent and safe mounting every session.