Bike Chain Wear Replacement Calculator
A worn chain accelerates wear on your cassette and chainrings. Enter your chain's measured elongation and riding habits to estimate wear percentage and how many miles you likely have left before replacement.
About this calculator
Estimate when your bike chain needs replacing based on mileage, riding conditions, and measured chain stretch to avoid drivetrain damage.
Frequently Asked Questions
How do I measure chain stretch?
Use a chain wear indicator tool, or measure 24 links with a ruler. A new chain measures exactly 12 inches over 24 links (48 pins).
At what wear percentage should I replace my chain?
Most manufacturers recommend replacing a chain at 0.5% wear for expensive cassettes/chainrings, or up to 0.75% for more tolerant, budget drivetrains.
What happens if I ride on a worn chain too long?
A significantly worn chain will accelerate wear on your cassette and chainrings, eventually requiring a full drivetrain replacement instead of just a chain.