Gear Ratio Calculator

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Ring and Pinion Ratio
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Ring & Pinion Ratios

Enter your ring and pinion ratio. The value must be between 1.00 and 9.99
Tire Height (inches)
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The most accurate way to measure your tire height

  1. Mark the tire sidewall and a corresponding spot on the floor.
  2. Roll the tire until the mark on the sidewall comes back to the floor and mark the floor again
  3. Measure the distance between the marks on the floor - this is the tire's circumference.
  4. To find the tire diameter, use this formula: Circumference ÷ 3.14 = Diameter.
  5. The diameter is the height of your tire
Upshift RPM
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Upshift RPM

This is the RPM which you will shift gears while accelerating. Normally you want this number to be at or slightly above the RPM at which the motor produces peak horsepower.
Gear RatioR&P RatioOverall
Drive Ratio
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Overall Drive Ratio

Overall Drive Ratio for each gear is simply the R&P ratio multiplied by the gear ratio.
1st
2nd
3rd
4th
Gear RatioR&P RatioOverall
Drive Ratio
Tip 5

Overall Drive Ratio

Overall Drive Ratio for each gear is simply the R&P ratio multiplied by the gear ratio.
5th
6th
7th