Have you ever wanted to ride your BMX or recumbent bike on your trainer? Well now you can thanks to Cycleops 20/24 Wheel Adapters for their range of Power Classic Trainers. Attach your BMX or recumbent bike to your trainer. Raises the resistance unit up to wheel height for smaller size wheels. For use with Cycle Ops Power Classic series trainers (Wind, Mag, Mag+, Magneto, & Fluid 2).