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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-16-2006, 11:54 PM   #1
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Default 18 inch wheels?

Has anybody here put 18 inch wheels on their 87 to 91 Bonneville?

If so what tire size do you run?

I was down at a local tire/rim shop and the guy brought out a 245/45 - 18 and it looked like it might fit.

The overall diameter looked about the same as my 225/60 16'* but they were a little wider.

Just wondering if there was any problem rubbing.

Also please post some pics of your 18'* if you have 'em.

Thanx, CD
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Old 02-17-2006, 11:38 AM   #2
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I would be interested in anyones experience in this to, considering I'm going to do it hopefully next month, it'd be nice to hear if anyone had any major problems to watch out for.
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Old 02-17-2006, 11:46 AM   #3
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I think you aren't getting responses because no one has done it. Take the measurements and show us how it looks. Be the pioneer
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Old 02-17-2006, 04:06 PM   #4
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Don't know what size these are, but these puppies are to die for...

http://www.bonnevilleclub.com/forum/...ic.php?t=45714
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Old 02-17-2006, 04:19 PM   #5
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Not sure I'm sold on those rims....
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Old 02-17-2006, 05:09 PM   #6
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a 245/45/18 is the biggest sze you can fit without problems, at least thats what is for the newer gen bonnies. If i had 18'* that is the size I would buy. If your still not sure, then try a 235/50/18 or something.
http://www.1010tires.com/tiresizecalculator.asp

just make sure the overall diameter is close. I say go with 245s. 18s would look sweet on these cars, ive seen pics of these cars with 18s.


EDIT: welcome to the club! you drive a sweet car
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Old 02-17-2006, 10:50 PM   #7
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Did a little research, looks like they should fit fine.

..........................Width........Sidewall height........Overall height.........Circumference


225/60 R 16......8.86" ...........5.31" .....................26.63" .....................83.66"


245/45 R 18 ......9.65" ..........4.34"..................... 26.68" ....................83.82"

difference......... +0.79" ........ -0.97"...................... +0.05".................. +0.16"

Actual Speed....Indicated Speed...........Speedometer Error

65 mph ............64.88 mph ....................... -0.12 mph

100 mph ...........99.81 mph ........................ -0.19 mph

If speedometer has been calibrated for 225/60 R 16 tires, replacing them with 245/45 R 18'* would result in the speedometer reading low by 0.19%.

Same as with the speedometer, if odometer has been calibrated for 225/60 R 16 tires, replacing them with 245/45 R 18'* would result in the odometer reading low by 0.19%.

Info from...
http://www.dakota-truck.net/TIRECALC/tirecalc.html

Quote:
phoenix_flame220 "welcome to the club! you drive a sweet car"
Thanx

CD
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Old 02-19-2006, 04:09 AM   #8
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Doug, I'm interested in your stock wheels if you get new ones. Also, I've got a white SSE bumper I'll trade for an LE, preferably silver, charcoal, or black in that order of preference.
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