Rpm Gear Ratio Speed Calculator Formula

The rpm of the assembly is the rpm motor divided by the reduction. Calculate the reduction by dividing 12 by 5 which equals 2 4. Write down the ratio of the speed reducer.

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Enter vehicle tire diameter.

Rpm gear ratio speed calculator formula. This calculator will provide the speed of the vehicle based on the transmission gear ratio the engine rpm the tire height and the ring gear and pinion gear ratio in the rear end axle differential housing. Enter vehicle rear gear ratio. You know the ring gear and pinion gear ratio. Drag max rpm slider to adjust the range of the rpm and kph gauges.

In our example it would be 5000 rpm 2 4 2083 rpm. You know the tire height in inches. When changing sprockets you can adjust chain links to maintain nearest to current sprocket centers eg. Enter diff gear ratios and tyre diameter then drag rpm slider to calculate speed from rpm.

Enter vehicle rear gear ratio 2. 5 speed or higher manual transmission in the last gear. Enter vehicle rear gear ratio 3. Vehicle speed mph engine speed rpm tire diameter inches trans gear ratio and rear axle gear ratio are all interrelated.

Not to be used in place of real testing. This calculation is used to match oversize tires with new ring and pinion gears to obtain the desired engine rpm at highway speed. Axle ratio x vehicle speed x transmission ratio x 336 13 tire diameter 3 73 x 65 x 1 00 x 336 13 31 2628. The ratios used for the transmissions are 0 70 for the automatic and 0 80 for the manual.

If you know four out of five of these values you can determine. Determine your engine s rpm based on the transmission gear ratio tire height mph and the ratio of your ring gear and pinion gear. Write down the rated rpm of your motor. For example 5000 rpm.

To keep motorcycle rear wheel within adjustment range. Calculate gear rpm mph tire diameter. See the gear ratio calculator in the spicer tool kit to determine your ratio. This calculator is for entertainment value only.

3 speed manual transmission in 3rd gear. Enter vehicle transmission gear. Enter shift at rpm select gear to shift to and hit auto shift to run up through the gears recording shift point rpm and kph. The lower the chain revolutions the more frequently each chain link engages the same sprocket tooth so greater and more uneven the wear.