Free tools
Calculators for riders & runners
Quick, free estimates for the questions every cyclist and runner asks about wear and replacement. No sign-up — and free to embed on your own site.
Chain life
Bike Chain Replacement Calculator
Estimate how many miles your chain will last — and when to replace it — based on the riding you actually do.
Open calculator →Shoe life
Running Shoe Replacement Calculator
Estimate how many miles are left in your running shoes and when to swap them — before dead midsole foam invites injury.
Open calculator →Drivetrain cost
The True Cost of a Worn Bike Chain
See what skipping a chain replacement really costs — a worn chain grinds out your cassette and chainrings, the expensive parts.
Open calculator →Or skip the math — let Pedal Wrencher track it from your Strava.
See how it works