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Apr 24, 2009 | 12:01 AM

Panther427

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New idea

So i have done a little research on how to adjust or gear ration based on tire sizes. This is based on the GXP's since we have the staggered sizes
changing from a 255/45/18 to a 255/35/18 drops tire size to 27" to 25"
(25.03) and drop the rears to a 225/40/18(25.09")

By dropping tire Diameter you will change the effective gear ratio. from 2.93 to a 3.16 for a 25" tall tire. A 24" tire would be 3.3:1. A 24" tall tire would be 3.43... This would be bad for fuel milage and be easier to spin the tires. but might help out over all

Apr 24, 2009 | 08:14 AM

VenomGXP

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Joined: Jan 2009

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From: Wyoming, MI

Wouldn't tire width need to change as well, even by a small margin, when lowering the aspect ratio? Or am I way off? Interesting thought, either way

Apr 24, 2009 | 01:10 PM

impala06ss

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From: Georgia

255 is a base number, it would not change nor have any effect on tire height. The 45 / 35 to which was referred is the variable which would change the height, it is the ratio of the the tire width.