Bike Speed from Gear & Cadence Calculator
See how fast a gear and cadence combination will move you, in km/h and mph.
How to use the bike gear speed calculator
- Enter chainring and cog teeth.
- Enter your cadence in rpm and pick your wheel size.
- Click Calculate to get your speed.
Matching gear to cadence
For any target speed there are many gear-and-cadence combinations. Finding a comfortable cadence in the right gear is key to riding efficiently for long periods.
How gear and cadence set your speed
Your speed is determined by how far each pedal revolution rolls you (your gear and wheel size) multiplied by how fast you pedal (cadence). This calculator shows the resulting speed, so you can see which gear lets you hold a comfortable cadence at your target pace.
Finding your comfortable cadence
Most cyclists are efficient spinning around 80-100 rpm. If a gear forces you well below that on the flat, it is too tall; if your legs spin out, it is too short. Matching gear to cadence keeps effort sustainable and reduces strain on your knees.
Frequently asked questions
How is bike speed calculated from gearing?
Speed equals development (metres per pedal stroke) times cadence times 60. Development is the gear ratio multiplied by wheel circumference.
What cadence should I ride at?
Most cyclists are efficient around 80–100 rpm. Higher cadence reduces muscular strain; lower cadence loads muscles more but can suit climbing.
What cadence should I aim for?
Many riders are most efficient around 80-100 rpm, though it varies. Climbing often drops cadence, which is where lower gears help you keep spinning.
Why do I spin out in my highest gear?
Spinning out means your cadence has maxed out the gear's speed. On descents this is normal; if it happens often on the flat, taller gearing would help.
How does wheel size affect speed?
Larger wheels roll further per revolution, so for the same gear and cadence they produce more speed. The calculator accounts for your wheel size.
Related tools
Gear Ratio Calculator
Work out your gear ratio, gear inches, and development from your chainring, cog and wheel size.
Speed Distance Time Calculator
Enter any two of speed, distance, and time, and instantly solve for the third.
Wheel Circumference Calculator
Get the circumference value to enter into your bike computer, by tire size or measured diameter.