Bike Gear Ratio Formula:
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The bike gear ratio compares the number of teeth on the front chainring to the number of teeth on the rear cog. It determines how many times the rear wheel turns for each pedal revolution.
The calculator uses the gear ratio formula:
Where:
Explanation: A higher gear ratio means more distance covered per pedal stroke but requires more effort. Lower ratios make pedaling easier but cover less distance per stroke.
Details: Gear ratios help cyclists choose appropriate gearing for different terrains. Higher ratios are better for flat/downhill, while lower ratios help with climbing.
Tips: Enter the number of teeth on your front chainring and rear cog. Both values must be positive integers (typically between 20-55 for front, 10-50 for rear).
Q1: What's a typical gear ratio range?
A: Road bikes typically range from 2.0-4.5, mountain bikes from 0.6-3.5, depending on gearing setup.
Q2: How does gear ratio affect speed?
A: Higher ratios allow higher speeds per pedal revolution but require more power. Lower ratios provide easier pedaling at lower speeds.
Q3: What's the difference between gear ratio and gear inches?
A: Gear inches incorporates wheel diameter, while gear ratio is purely about the relationship between chainrings and cogs.
Q4: Should I always use the highest gear ratio?
A: No, choose ratios based on terrain and your fitness level. Optimal cadence (pedal RPM) is typically 80-100 RPM.
Q5: How do I change my gear ratios?
A: By changing your chainrings or rear cogs to ones with different tooth counts, or by using a different cassette.