# How to Calculate the Gear Ratio for a Tire?

The easiest way to calculate the gear ratio for a tire is with a calculator. You can find an on-line calculator at:
Reference:
Ask.com Answer for: how to calculate the gear ratio for a tire
How to Calculate the Gear Ratio for a Tire
You can calculate the gear ratio for a tire manually or by utilizing an online calculator. Gear ratio is related to the size of the tire and the RPM output of the engine. When you decrease the size or diameter of the tires on your vehicle, the engine... More »
Difficulty: Moderately Easy
Source: www.ehow.com
Q&A Related to "How to Calculate the Gear Ratio for a Tire"
 1. Count the number of pinion gear teeth and ring gear teeth when installing a new gear set in your vehicle. The pinion is connected to the vehicle's driveshaft and turns the ring http://www.ehow.com/how_5965910_calculate-gear-rat...
 1. Multiply the gear ratio by the engine speed in revolutions per minute. If the gear ratio is 5.35 and the car runs at 4,000 RPM: 5.35 x 4,000 RPM = 746.97. This is the axle speed http://www.ehow.com/how_7550405_calculate-gear-rat...
 1. Measure the diameter of your tire with a tape measure in inches. Start from any edge of the tire and measure directly through to the opposite side. For the example, use the tire http://www.ehow.com/how_7871319_calculate-tire-dia...
 1. Measure the old tire size, in inches, with a tape measure. Also measure the new tire size, in inches, and write both numbers down. 2. Divide the new tire size by the old tire size http://www.ehow.com/how_4450816_calculate-gear-rat...
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