Demonstrates how to measure a worn out chain using Sheldon Brown’s ruler technique.

Shows how to disconnect and reconnect two of the most common quick release chain links.

How a chain tool works, and how to use it to disconnect and reconnect your bike chain.

Stiff chain links cause noise, shifting problems, and even injury. Watch how to fix it by hand!

Frequent chain cleaning and lubrication will help keep dirt off your chain and prevent wear.

Measure the correct length of a new bike chain.

Using WD-40 as a chain lube can actually damage your chain.