Free calculators to help you dial in your gearing and conquer any route.
See every gear combination your drivetrain can produce. Enter your chainrings, cassette range, wheel size, and cadence to get a full table of gear inches and estimated speeds.
Compare two possible bike setups and see the tradeoff between top speed and climbing ease before you buy parts or commit to a drivetrain.
Upload a GPX file or paste a RideWithGPS URL to find out if your gearing and fitness are a match for your planned route. Get climb-by-climb recommendations tailored to your FTP.