Gear Ratio / Tire Size Information

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Gear Ratio / Tire Size Information

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Blazer Forums >> Modifications >> Suspension Tech >> Gear Ratio / Tire Size Information

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Gear Ratio / Tire Size Information - 8/22/2007 8:11:17 PM

a_tack

Suspension Tech Moderator
Posts: 1287
Joined: 4/5/2006
From: Ashland, Kentucky
Status: offline

I have seen alot of question about gear ratios and larger tires, SO I have searched and found some information on the subject and would like to post it here to answer your questions.

Interco Tires has put together the information listed below along with this table.

A good "rule of thumb" calculation is to mutiply .12 by your tire diameter.
Example: (.12 X 38" = 4.56)

Gear Ratio

Crawl Ratio

P-Metric to Inch Diameter

Tire Change (find new gear ratio)

Speedometer Adjuster (with oversize tires)
(New Tire Diameter / Old Tire Diameter) * Speedometer MPH = Actual MPH

Simple Gear Ratio Formula
Ring Gear Teeth Count / Pinion Gear Teeth = Gear Ratio

< Message edited by a_tack -- 1/15/2008 7:58:18 AM >

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-Aaron