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Gear Ratio also solve for MPH or RPM

Tire Diameter:   Tranny Ratio:   Crawl      Ratio Diff Ratio:   Transfer Case Ratio: RPM:   MPH:

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Tire Size Change, find new differential ratio.

New Tire Diameter: Old Tire Diameter: Current Gear Ratio:   Actual      Ratio Hi Ratio: New Ratio: Lo Ratio:

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Metric Tire to Inches Conversion

Example: LT235/75R16 = 30" LT / R = Diameter '' Section Width: ''    Section Height: ''

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Ring and Pinion Ratio Using Tooth Count

# Ring Gear: # Pinion Gear: = Gear Ratio:

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Speedometer Check

Orig Tire Dia: New Tire Dia: Speedometer: Actual: