Designed by a cyclist, Bicycle Gear Calculator is a complete Gear Calculator for your iPhone/iPod Touch.
Evaluate current or potential Gearing Ratios, calculate Gain Ratios, Gear Inches, and Development (Rollout), considering crank arm length and tire size.
Using the Skid Patch Analyzer, visualize your tires wear spots and choose optimal gearing to maximize your tire longevity.
Already have a spare Chain Ring or Sprocket? Explore equivalent gearing configurations that are similar to your wished ratio, while using parts you already have.
