🚵 Gravel Bike Tools

Free calculators to help you dial in your gearing and conquer any route.

Sign In
Calculator
Gear Ratio & Inches

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.

  • Full gear-inch table for any drivetrain
  • Speed at your chosen cadence
  • 700c and 650b wheel support
  • Highlights lowest and highest gear
Compare
Gearing Side-by-Side

Compare two possible bike setups and see the tradeoff between top speed and climbing ease before you buy parts or commit to a drivetrain.

  • Side-by-side drivetrain comparison
  • Percent faster or slower top speed
  • Percent easier or harder climbing
  • Works with saved bike profiles
Analysis
Route Fitness & Gearing

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.

  • Automatic climb detection from GPX data
  • Power demand vs. FTP for each climb
  • Gear recommendations per segment
  • Gravel, dirt, and pavement surface factors