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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 02-24-2004, 10:30 PM   #1
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Default Tire size question

I am looking at some 18" rims and the shop that is selling them is offering me a set of 225/40/18 Dunlop SP Sport 5000'* for a great price. I'm talking NEW 18" rims and NEW tires for under $400. Just have one size tire and don't want something too small.
My question is are 225/40/18'* too small for my 1999 SSEi?
Thanks in advance,
Martin
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Old 02-24-2004, 10:49 PM   #2
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Tire Size Comparison

Specification / Sidewall / Radius / Diameter / Circumference / Revs/Mile / Speed Difference
225/60-16 / 5.3in /13.3in / 26.6in / 83.7in / 757 / 0.0%

225/40-18 / 3.5in / 12.5in / 25.1in / 78.8in / 804 / -5.8% (5.8% too fast 60mph will be 56.5mph)
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Old 02-24-2004, 10:58 PM   #3
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Try to maintain the diameter the best you can Martin...those trannys are electronically geared, you dont want to do any unwanted damage
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Old 02-24-2004, 11:32 PM   #4
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You also dont want to rack up more miles on your odometer than you are putting on.
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Old 02-25-2004, 10:10 AM   #5
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yea if i remember correctly at www.tirerack.com they suggest 245/45r18 tires for the 92-99 bonnevilles with 18" rims.......just my 2 cents
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Old 02-25-2004, 03:09 PM   #6
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tire size calculator in Techinfo.
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