Calculate New Gear Ratio
You've added bigger meats and the new tires are stealing your performance and gas mileage. Enter
your original tire size, your new tire size and your stock R&P gear ratios to compute what your
new gear set ratio should be.
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Engine RPM Calculator
To calculate what your RPM's should be for your engine, enter your ring and pinion gear ratio, your tire
height in inches and the speed you'd like to drive in m.p.h.. Click "calculate" to solve.
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Recommended
RPM @ 60 mph:
4 cyl: 2300-3200
6 cyl (Inline): 2300-2800
6 cyl (V6): 2500-3200
Sm. Block: 2400-2800
Big Block: 2200-2600
GM Diesel: 1800-2800
Ford Diesel: 1700-2700
Dodge Diesel: 1600-2600
*Auto = 1:1 final ratio
*Manual = 4th gear in a 5 speed
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Tire Height Calculator
Enter tire width, aspect and wheel and click 'solve' to calculate tire height.
Metric measurements for tires use three numbers (example 275/75R15). '225' is the WIDTH of the
tire in millimeters. '75' is the Aspect, which means that the sidewall is 75% as tall as the tread is wide. '15'
is diameter of the Rim, measured in inches. Enter your tire information below to calculate how tall
your tire is in inches.
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Compound Low Range Calculator
Ever wanted to know what your "crawl ratio" was? Just enter your Transfercase low-range gear
ratio, your first-gear transmission gear ratio, and your ring & pinion gears gear ration.
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Convert Cubic Liters / Cubic Inches
Convert engine sizes from Cubic Liters to Cubic Inches and vice versa
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