Calculate speedometer gear ratio for accurate speed reading.
Drivetrain Specs
Gear inside the trans (usually 6-9)
Results Title
Teeth Count18.8Number of teeth
Buy this gear:19 Tooth
Tire Revolutions:720.3 / mile
Note: If the result is between sizes, choosing a smaller gear will make the speedometer read slightly 'fast'.
Overview
Speedometer gear calculation corrects speedometer after tire/gear changes. Based on tire diameter and differential ratio. Essential for accurate speed and odometer readings.
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Pro Tips
Increasing the axle ratio (e.g., from 3.08 to 4.10) requires a gear with MORE teeth.
Increasing tire size requires a gear with FEWER teeth.
Fun Fact
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Fun Facts
Formula: New Gear = Old Gear × (New Tire / Old Tire) × (New Ratio / Old Ratio)
