CycleOps 20 and 24-Inch Wheel Adapter for Indoor Bicycle Trainers Allows you to use your BMX or recumbent bike with your trainer. Raises the resistance unit up to wheel height for smaller size wheels. For use with Wind, Mag, Magneto, Fluid2 and PowerSync. Raises resistance unit to the height of a bike's wheel Allows you the same feel as if you were riding the trainer normally The perfect tool for adapting a BMX or recumbent bike to work with a trainer Works with standard cycles