Why does my bike chain gets loose?
Your chain might simply be too old or can stretch over time. When this occurs you need to replace it. Consider that your loose chain also may be due to operator error. Exceeding the recommended gear range for the rear derailleur on your bike may lead to a droopy chain when you ride in these gears.
How do you tighten a loose chain on a bike?
How to Tighten a Bike Chain
- Loosen your tire. Loosen the bolts that hold your rear tire.
- Pull back the tire. Move the tire back until the chain starts to tighten.
- Find the appropriate tension.
When should I tighten my bike chain?
The chain should be tight enough that it only allows you to move it up and down about half an inch. If there is no slack in the chain then it is too tight. And if there is too much slack then you need to tighten that chain.
How do I know if my bike chain is too loose?
On a derailleurless drivetrain, you should be able to lift the chain about 1/2 inch above its resting position at the middle of the chain above the gears. If the chain is too tight, you might feel and hear binding in the drivetrain as you pedal. If it is too loose, the chain could skip or drop, and you can see it sag.