Clinical Accuracy Verified
Data verified on 2026-04-20 Reviewed by Michael R. Chen, CPA, CFP®
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Bike Gear Ratio Calculator
Calculate gear inches and development meters to optimize your cycling cadence and spread.
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
Gear Inches
A measure of how far the bike travels with one revolution of the pedals.- High Gear: Hard to pedal, go fast (e.g. 53x11)
- Low Gear: Easy to pedal, climb hills (e.g. 34x32)
⚙️ Gear Ratio & Speed Examples (90 RPM)
| Gearing (Front x Rear) | Ratio | Speed (700c Tire) | Best Use | | :--- | :--- | :--- | :--- | | 53 x 11 | 4.82 | ~53 kph (33 mph) | Sprinting / Descending | | 50 x 14 | 3.57 | ~39 kph (24 mph) | Flat Cruising | | 34 x 28 | 1.21 | ~13 kph (8 mph) | Moderate Climbing | | 34 x 32 | 1.06 | ~11 kph (7 mph) | Steep Climbing (>10%) |
Results Bike Gear Ratio Calculator
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