So you get on your trusty stationary bike for your daily dose of indoor exercise, only to be met with a distracting clunking noise the moment you start pedaling.
If you’re wondering what could be the reason behind this knocking sound, then you’ve come to the right place.
Today, we’re explaining all the common causes of clunking noise when pedaling a stationary exercise bike and how to fix them if your warranty is no longer valid.
The Pedal Is Loose
If a knocking noise occurs when you start pedaling your exercise bike along with a sort of grinding sound, it may be something as simple as a loose pedal.
How To Fix
You can resolve this issue by either tightening the loose pedal on the stationary bike or replacing the pedal.
The choice depends on the state of the bike’s pedal.
If the pedal(s) aren’t so damaged that they loosen again after fastening, then simple retightening should be enough.
However, if the faulty pedal(s) keeps loosening after tightening, then installing a replacement is the better option.
The Bearings Are Loose or Broken
If you hear a clunking sound when you pedal, the problem could be loose or damaged bearings.
How To Fix
To resolve this issue, you should first check each bearing on your pedals to pinpoint the one(s) that has come loose. From there, tighten the screws and then try pedaling again.
If you spot a broken bearing, simply look at the type printed on it, then google it to buy a replacement. Most manufacturers install universal bearings, so finding them should be easy.
The Flywheel Belt Is Loose
A clunking sound can be the result of your flywheel rubber belt getting loose after years of heavy use.
How To Fix
As with bearings, most manufacturers use universal belts. Your belt should have the type printed on it, so you can easily find a replacement online.
The Brake Pads Are Damaged
A clunking noise upon pedaling can be a sign of damaged or dirty brake pads.
How To Fix
Start by cleaning the rim’s braking surface, then wipe the brake pads using some rubbing alcohol. After that, use sandpaper to rough them.
However, if the pads are worn out, replacing them is the most effective solution.
The Bottom Bracket Is Loose
A clunking noise that happens upon pedaling can be because of a loose bottom bracket if you’re sure the pedal itself isn’t loose.
How To Fix
Tightening the bottom bracket involves detaching the crank arms to expose the bracket. From there, adjust the bearings and. fasten the bracket cups.
The Chain Is Dry and Dirty
If you hear a clunking noise with some squeaking and your bike is an older model, then the culprit could be a dry and dirty chain.
This is more likely if it’s been too long since you last lubricated or cleaned the bike’s chain.
How To Fix
Untangling this mess is pretty straightforward. Use a toothbrush and some degreasers to remove grime from the chain.
Once clean, oil the chain with a few drops of lube, then use a rag to wipe off any excess lubricant.
The Internal Cables Are Improperly Routed
Stationary exercise bikes share many similarities with moving bikes. But when it comes to the routing of the internal cable, they don’t see eye to eye.
In stationary bikes, the internal cable routing is fixed. A clunking noise upon pedaling could be a sign of improper cable routing.
How To Fix
You can resolve this issue by taking the bike apart and reinstalling it, closely following the instructions manual.
If you’re not confident you can do that, or if the bike came pre-installed, contact your seller/provider and ask for a maintenance appointment.
Final Thoughts
There you have it – if you hear a clunking noise when pedaling your stationary exercise bike, the reason is likely to be a loose pedal, loose cleat, dry/dirty chain, or damaged brake pads.
If you’re sure it’s none of these, then the cause may be a loose bottom bracket, a broken wheel, or faulty internal cable routing.