Some parts you may be shopping for are optional after-market equipment. Start your search for exercise parts at Sears Parts Direct More typical repairs include replacing brake pads which run $10 to $20 depending on your bike brand. As long as you don’t need to buy an entirely new console, the most expensive part you may ever need to buy is a $40 crank arm set or a $30 drive belt. Most exercise bike parts are affordable and easy to replace should something break or need upgrading. Since parts do wear out you may need to repair your bike yourself sooner or later.