Scientific Accuracy Verified
Bike Gear Ratio Calculator
Calculate gear ratios, gear inches, and speed at cadence for road, MTB, and gravel bikes.
Drivetrain
Physics
90
Grinding (60)Spinning (90)Sprinting (120)
Gear Ratio
4.55
Gear Inches
122.7"
Speed (km/h)
52.9
Speed (mph)
32.9
*Calculated Development: 9.79 meters per pedal stroke
Understanding Bike Gears
- Gear Ratio: The mechanical advantage of your drivetrain. A higher number means a harder gear (more distance per pedal stroke).
- Gear Inches: A classic system to normalize gears across different wheel sizes. An old "high wheeler" (Penny Farthing) with a 60-inch wheel had a gear of 60 inches. A modern road bike in 53x11 has a gear of ~126 inches!
Why It Matters
- Climbing: You generally want smaller Gear Inches (below 25") to spin easily up steep grades.
- Sprinting: You want high Gear Inches (100"+) to maximize top speed without spinning out.
Related Tools
View All Tools →
One Rep Max Calculator
Calculate your estimated 1RM (One Repetition Maximum) for squat, bench press, and deadlift based on your reps.
Vertical Jump Power Calculator
Estimate your vertical jump height and peak explosive power using the Sayers Formula.
Strength Standards Calculator
Compare your lifts against other lifters at your bodyweight. Are you a beginner, intermediate, or elite lifter?