Bolt on to the rear of a bike and convert to a tricycle. Use 5/8" hollow hub wheels. 5/8" axle with fixed sprocket. Works on 20", 24" and 26" bikes.
Bicycle Bike to Tricycle Trike Conversion Kit Axle for (20"/26") NO FRAME CHROME
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Stamina Conversion II Recumbent Exercise Bike and Rower - Cardio Machine with smart Workout App - Exercise Bike for Home Workout - Up to 250 lbs Weight Capacity