Tires data for Bonneville 90 needed - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-31-2003, 06:39 AM   #1
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Default Tires data for Bonneville 90 needed

Hi all!

Would somebody advise me the following:

Is it possible to install 1. 225/65/R15
2. 215/70/R15
tires instead of default 215/65/R15?

Many thanks in advance,

Bozz $ Bonneville LE, 1990
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Old 01-31-2003, 09:36 AM   #2
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Wow! Another Russian member! This is great!

First off, welcome to the forum.

To answer your question, yes those tires will fit. There will be only a slight error in your speedometer display, since your first choice of tires is 13mm larger in diameter (-3.11 kph @ 160.9 kph). Since the tires are only 10mm wider, so there should not be any interference.

Your second choice, I would advise against. There will be more speedometer error, since these tires are 21.5mm larger in diameter (-5.07 [email protected] 160.9 kph). You may also experience slightly less cornering manuverablity due to the taller sidewalls.

You can find out about other tire sizes here:
http://www.c5-corvette.com/tirecalc.htm

For example, you could go with 235/60R15 if you verified that there were no clearance problems due to the 20mm increase in width. Also, if you were looking to put 16" rims on your car, 235/55R16 tires would be almost an exact match.

Jay
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Old 01-31-2003, 03:20 PM   #3
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Jay is Mr. Tire, but I can tell you that if you wanted to go up to 245'*, you could. 255'* will actually fit with minor modifications, but I'm betting you're looking at winter tires, so the narrower tires are a good choice.
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Old 01-31-2003, 04:09 PM   #4
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235/55/16 will fit like a glove without any modifications.
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Old 02-03-2003, 10:58 AM   #5
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Gentlemen, thanks all for replies.

My idea is to get wider tires with the same (or bigger) clearance from the ground. As for now I have 205/70/R15 tires installed on original GM 15'' rims. The car looks ugly with such narrow tires. From another side I used to go to the village with all big family while the roads are not very good here. From your comments I understood that 225/65/R15 is right that I'm looking for (appearance/clearance/price ratio). Just some more concerns: Will these tires fit my 15'' rims or I need to buy wider rims? Will I still be able to do max turn without any interference with the body of the car?

Again, many thanks in advance,


Bozz $ Bonneville LE, 1990
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Old 02-03-2003, 01:18 PM   #6
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225 should be fine, and should fit stock rims. I'm not positive about the clearance on the 87 to 91 models, but I'm pretty sure there'* enough room. They're very similar to the later models in dimensions. Perhaps someone running wider tires on an older model can tell us how they work?
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Old 02-04-2003, 11:58 AM   #7
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Anyway should try 225/65/R15 and then let folks know on how it goes on.

Many thanks

Bozz
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Old 02-04-2003, 02:13 PM   #8
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Good luck, and post your results. Someone else might want to try this.
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