Gear Ratio, Gear Inches & Speed Calculator
What does a given gear actually feel like — and how fast does it go? Enter your chainring, cog and wheel size for the ratio, gear inches and development, then add a cadence to see your speed. It’s how you compare setups before you buy.
Gear ratio & gear inches
Wheel / tyreThe front ring you’re in.
The rear cassette cog.
Speed at your cadence
Most riders cruise around 85–95 rpm.
Enter your chainring and cog above to see the speed this gear gives at your cadence.