Starting Line Ratio Calculator

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Use this calculator to see what your starting line ratio is.
You can also use a different tire height to see how it affects the SLR
(see the effects of tire height change without changing the rear gear ratio)

Starting Line Ratio Calculator

** - Input same tire diameter as the original tire diameter, if not changing tire diameters - **

Input DATA Please
SLR Calculator

First Gear Ratio:

 Rear End Gear Ratio:

 Tire Diameter:


 New Tire Diameter:

Inches **


A 9-10-11 range SLR is desireable.

For a clutch type vehicle this works good. Some racing automatics, the torque converter has an effect on the ratio. With a higher stall converter, the ratio can be smaller, making a rear gear able to be a higher gear for more top end.

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