Bike Chain Wear Calculator

Check bicycle chain wear by measuring 12 links against the 12-inch new length, with a replace-now or replace-soon status

Frequently Asked Questions

When should I replace my chain?

Modern 11 and 12 speed chains should be replaced at about 0.5 percent wear to protect the cassette. Older, wider, and single-speed chains can usually run to about 0.75 percent.

How do I measure chain wear?

With the chain under light tension, measure from the center of one pin to the center of the pin 12 links away. A new chain measures exactly 12 inches over those links.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.