Tire Size to Axle Ratio Calculator

Formula

To calculate the new gear ratio (NGR):

\[ NGR = \frac{New \ Tire \ Diameter}{Current \ Tire \ Diameter} \times Current \ Gear \ Ratio \]

Where:

\(NGR\) is the New Gear Ratio
New Tire Diameter is the diameter of the new tires (inches)
Current Tire Diameter is the diameter of the current tires (inches)
Current Gear Ratio is the current gear ratio

What is the Tire Size to Axle Ratio?

The Tire Size to Axle Ratio is a measure used to determine the impact of changing tire sizes on the vehicle's gear ratio. It helps in understanding how the new tire size will affect the vehicle's performance, including acceleration and fuel efficiency[^1^][^2^].

Example Calculation 1

Let's assume the following values:

Current Tire Diameter = 30 inches
New Tire Diameter = 35 inches
Current Gear Ratio = 4.0

Using the formula:

\[ NGR = \frac{35}{30} \times 4.0 = 4.6667 \]

The New Gear Ratio is 4.6667.

Example Calculation 2

Let's assume the following values:

Current Tire Diameter = 28 inches
New Tire Diameter = 32 inches
Current Gear Ratio = 3.5

Using the formula:

\[ NGR = \frac{32}{28} \times 3.5 = 4.0 \]

The New Gear Ratio is 4.0.