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Oldsmobile Forum: Wheel change on 1999 Olds 88 LS
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1999Olds88 1999Olds88 is offline
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Thumbs up Wheel change on 1999 Olds 88 LS

My '99 Olds 88 has the factory aluminum 15 x 7 - 12 slot alloy wheels
I'm interested in upgrading to the ( better looking in my opinon ) factory aluminum 16 x 7 - 5 slot star alloy wheels. I'm currently having a set restored.

If you read below the wheel tire combo I'm switching to has a smaller circumference of 83.6" compared to my current 85.1" circumference. I have two questions. 1. Which transmission is paired to my 3800 Series II engine? It's a 4 speed OD. Is it the GM 4T65-E? 2. How would I re-calibrate the speedometer which will obviously will be reading to fast? Would it require a speedodmeter pinion change? or ? Any help would be appreciated! Thanks! Chris

I found this on E-Bay is this what I'd need?
https://ebay.us/vT7wB4

My current 205/75R15 tires have a diameter of 27.1", and a wheel diameter of 15". The circumference is 85.1" and they have 744 revolutions per mile.


The factory 16 x 7 tires I'm switching to will be 225/60R16 tires that have a diameter of 26.6", and a wheel diameter of 16". The circumference is 83.6" and they have 758 revolutions per mile.
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