Bike Gear Ratio Calculator
Calculate your bicycle's gear ratio and development (the distance travelled per crank revolution) from the chainring and sprocket tooth counts. A higher ratio is a harder, faster gear; a lower ratio is easier for climbing. The result includes a quick feel guide so you can see whether a gear suits sprinting, flats, or hills.
Formula
Gear Ratio = Chainring Teeth / Sprocket Teeth. Development = Gear Ratio × Wheel Diameter × π.
52T chainring, 16T sprocket
Inputs
- Chainring Teeth (front): 52 T
- Sprocket Teeth (rear): 16 T
Gear ratio = 52/16 = 3.25:1, a hard gear suited to fast flat riding. Development is about 7.15 m per crank revolution.
Frequently asked questions
What is a bike gear ratio?
It's the chainring tooth count divided by the sprocket tooth count. It tells you how many times the wheel turns for one full turn of the pedals.
What is development?
Development is how far the bike travels per crank revolution — the gear ratio multiplied by the wheel circumference. Bigger development means a harder, faster gear.
Is a higher gear ratio better?
Not always. High ratios are fast on flats and descents but hard to push uphill. Lower ratios spin more easily for climbing. The best gear depends on terrain and effort.
How do I make climbing easier?
Lower the gear ratio — use a smaller chainring or a larger sprocket. This reduces the distance per pedal stroke so you can spin up hills with less force.