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 Mar 3, 2003 | 12:27 AM
  #11  
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1mph low at 55 with the 225'* vs stock.
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Old Mar 3, 2003 | 12:36 AM
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ahhh....but he DID change the height. It'* a ratio. If you change the width, you MUST change the 60/50 ratio to keep the rolling diameter as close as possible.

He changed it, but not by much.
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Old Mar 3, 2003 | 12:55 AM
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Originally Posted by jr's3800
Originally Posted by willwren
ahhh....but he DID change the height. It'* a ratio. If you change the width, you MUST change the 60/50 ratio to keep the rolling diameter as close as possible.

He changed it, but not by much.
True, but at the same time is 1 mph really anyhting to worry about...?? So are you trying to say that he has a rolling ratio simmilar to say 59 instead of 60 series, because he went to a wider tire.. I could understand if he went from a 65 series tire to a 60 series tire... Then there would be some speedo issues... But as far as going to a wider tire 225 vs the 215... he really has nothing to worry about... In the same as long as you stick with the 60 series 16 inch, 225 or 235... the change won't be anything to worry about..but i'm sure a 50 series or 40 series would cause problems...
Aspect ratio changes the wider you go.....My 225/60/16'* mean that my sidewall is 60% of the 225. His sidewall height is now 60% of 225, which means it'* slightly taller than if it were 60% of 215.
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Old Mar 3, 2003 | 02:45 PM
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Use the calculator Jay found. That'* what I used last night. Techinfo, Tech Know-how. There'* actually a bunch of these floating around cyberspace.

Shame on you. You're supposed to KNOW what'* up there!
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Old Mar 3, 2003 | 07:06 PM
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yep-it'* a tad taller sidewall. The stock size was 215/60-16, I went to 225/60-16.
Taller and narrower.
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Old Mar 3, 2003 | 07:24 PM
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Taller and WIDER.
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