Gear Speed Calculator
Calculate speed from gear ratios. Understand how chainring teeth, cassette cogs, and cadence combine to determine velocity.
Your speed on a bike is determined by three factors: your gear ratio, your tire circumference, and your cadence (pedal speed).
The number of teeth on the front chainring divided by the number of teeth on the rear cog. A 50/11 ratio (4.54) means the rear wheel turns 4.54 times for every single pedal stroke.
A classic measurement that represents the equivalent diameter of the wheel of a penny-farthing bicycle. It allows you to compare gearing across different wheel sizes (e.g., road vs MTB). Higher number = harder gear.
Revolutions per minute (RPM) of the cranks. Most efficient cyclists aim for 80-100 RPM.
Good for climbing.
Preferred by racers for higher top speed.
A popular modern balance.