Tires and rims - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-23-2005, 07:07 PM   #1
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Default Tires and rims

I'm in the market for a set of aftermarket rims. My car has 16'* on it. If I go to 18'* will the speedo be off? How do you adjust this?
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Old 10-23-2005, 08:13 PM   #2
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with 18'* it depends what the diameter of the wheel and tire combination to see just how off it will be if it'* the same diameter as the 16'* with the stock tires then you should be all set. and for computer controlled speedo'* the only real way to do so is with a computer chip or flash or something along those lines 9 times out of 10 it wont be much of a change if not a mile or two.
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Old 10-24-2005, 12:47 AM   #3
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Default 18 inch rims

Your stock tires are probably 225/60X16 which are 26.63 inches tall. A 235/50X18 is 27.25 inches and a 245/45X18 is 26.68 inches high. Either would work since your speedo is slightly optimistic by about 3 to 5% from the factory. [70 mph indicated is actually 67 to 68 true mph] These larger tires with their short sidewalls will have a very stiff ride and usually the largest tires have low treadwear ratings and may wear out sooner. Hope this helps.
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