How To Fix Bicycle Loose Chain. I bought a vintage Atala road bike that had a drooping saggy chain. The simple method is to get your hands on the chain and pinch it together.
In this case you will need to use a chain breaker. If not you can adjust the links in the chain. Basic cheaper bikes that need a simple chain will be closer to 10.
If it is sagging or much looser than that you need to tighten that chain up.
Unlike geared bike chains diagnosing whether a BMX chain needs to be tightened is very easy. This is a temporary fix you will eventually need to replace your loose chain or your entire drivechain due to wear. On every multi-gear bike there is a small screen positioned at the back of the derailleur. Bicycle chain is a roller chain that transfers power from the pedals to the drive-wheel of a bike thus propelling it.
