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www.manualslib.com > ... > Exercise Bike > Pro Upright Bike Exercise Bike Star Trac Upright Sport Bike Owner's Manual. Stationary sport bike (28 pages) ... Pro Upright Bike Pro Recumbent Bike ' W N E R A N U A L..
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The problem might be the gearbox. I know because I have the same problem.
Keys fitness is out of business, but "The Treadmill Doctor" has purchased the inventory of parts for the bikes. They will help you troubleshoot, and have parts available if you need them. The number is 1-888-340-0482. Or, you can go to treadmilldoctor.com.