Calculates gear ratio, gear inches, km/h and mph.
Quick answer
Connects tooth counts, cadence and wheel circumference.
Helps compare setups, cadence targets and race gearing.
What gear ratio means
Gear ratio describes the relationship between chainring and rear cog. A larger ratio moves the bike farther per crank revolution but requires more force. A smaller ratio helps on climbs and lower speeds.
- Large chainring and small cog create a harder gear
- Small chainring and large cog create an easier gear
- Cadence and wheel circumference determine resulting speed
How to use the calculator in training
Use the tool to check which speed is possible at a realistic cadence. It helps with intervals, time trial setups, climbing gears and deciding whether a cassette fits your target course.
Why gearing is only one part of the decision
The perfect gear depends on power, aerodynamics, route, wind, fatigue and technique. The calculator gives the mechanical baseline. YOUB adds training data and context in coaching.
FAQ
Free gear ratio calculator
How do I calculate bike gear ratio?
Divide chainring teeth by rear cog teeth. A 52 tooth chainring and 11 tooth cog create a gear ratio of 4.73.
What are gear inches?
Gear inches combine gear ratio and wheel size. The value helps compare how hard or easy a gear feels across setups.
Which cadence should I enter?
Use a realistic cadence for your use case. Many endurance rides sit roughly between 80 and 95 RPM, but individual values can differ.
More pages for cycling training and setup
