Bike chain length

Chain length on a bike is a big and complicated topic, although it may not seem like it. A properly sized bike chain is essential for smooth shifting, pedaling efficiency, and drivetrain longevity. Whether you’re upgrading components or replacing a worn-out chain, getting the right size is a must. Here’s how to determine the correct length and width for your bike chain.

Type of bike chains

It is important to use the right chain for the right system. Chains are based on the number of sprockets on the cassette. It is also advisable to use a chain from the same brand as the derailleur.

Gear System	Typical Chain Width
Single-speed	1/8″ (3.2 mm)
6–8-speed	3/32″ (7.1–7.3 mm)
9-speed	6.7 mm
10-speed	6.2 mm
11-speed	5.5 mm
12-speed	5.3 mm

Right bike chain length

We are using method large – large (large chainring – large sprocket). For this wrap the new chain around the largest chainring and largest cassette cog, bypassing the derailleur. The position where both chain ends overlap is called the zero position. From zero position add links according to the following below.

1. Hardtail and road bikes

Add 4 or 5 full links and use quick-link or
add 5 or 6 full links and use connecting pin

2. Full suspension bikes

Add 5 or 6 and use quick-link or
add 6 or 7 and use connecting pin

Quick-link or connecting pin

Quick link is usually easier to handle. Connecting the pin requires the use of a chain riveter, but can be tighter.

Chain riveter