If your stationary bike is making unusual noises, you should temporarily discontinue use and troubleshoot the fitness equipment to determine the problem. If you are unable to resolve the issue at home, contact your bike's manufacturer for additional system. You may need to order a replacement part to fix the problem. Check your warranty coverage before you disassemble pieces of the exercise bike. Working on the bike at home may void any warranty coverage you may have.
Surfaces
If your exercise bike is placed on an uneven surface, you may notice noise and some wobbling while you use it. Choose a level surface or adjust the base in order to maintain a level position. If you use the stationary bike on hardwood flooring, it may operate louder than if you install the machine in a carpeted room. To prevent wobbling during use, keep your behind centered on the saddle without leaning to one side or the other.
Assembly
Check all bolts of the stationary bike if you hear a chirping or squeaking noise while in use. Before tightening the bolts, loosen each one and grease the threads. Replace the bolts and tighten again. Refer to your owner's manual if you have difficulty locating all of the bolts on the machine.
Brake
Listen for any internal noise if you find it difficult to operate the bike at a high resistance level. If you feel roughness during operation and you hear a banging noise when pedaling, it can indicate brake failure if the stationary bike uses a magnetic resistance system. The noise occurs from the magnetic brake hitting the flywheel of the bike. Contact the manufacturer to find out how to repair the bike.
Alternator
You may test the alternator of your stationary bike if you hear loud noises while it is in use. Attach a DC voltmeter to the red and black leads of the alternator. Pedal at a higher speed than 45 rpm. The voltmeter should read 9 to 11 VDC if the alternator is functioning correctly. Replace the alternator if the reading is not in the correct range.
Belt
A loose or worn alternator belt may also cause noise from your exercise bike. Instead of replacing the entire alternator, reposition the belt if loose. In the case of worn belts, replace the belt.
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