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87911jon's Avatar
 
Join Date: May 2002
Location: Parkton MD
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What tires will fit?

Hello, need some expert tire advice. I just bought a set of C2 23 MM offset, 7" fronts and 9" rear rims for my '86 951. What size tires will best fit? I want fat in the rear but not fat enough to rub. Thanks in advance, Jon
Old 06-18-2007, 04:35 AM
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You should be able to fit 255/40ZR17's in the rear with no problem, I had 18x10's on my 944S I used to own with 285/30R18's, so 255's shouldn't rub at all.
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Sans Porsche...for now
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Old 06-18-2007, 04:52 AM
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Join Date: Mar 2004
Location: Hayward CA. USA
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Jon, i'm running 275/40r17 on the rear and 255/40r17 on the front and car is lowered 1" front, 1 1/2 rear with no rub. Just make sure the correct offset is used.
I beleive the C2 use a different (newer) offset. Like my 1986 951 you will need the correct wheel adaptors for proper fitting otherwise the wheel will be pushed into the fenderwell. The 86 year as you may know have a different suspension from any porsche 87 and up and use wheels of different offset.
I have boxter wheels which have the same offset as the C2 and i as you have started with 7's front and 9's rear. I now run 8 1/2 on the front.
1st you must mount the rim to the car and measure the available space between the fender and the inner fender. You can use the "tire rack web site" to get the tread width in their spec's page so you have an idea of available space. Remember when trying to fit the biggest tire width in an available space you must give proper spacing (preferably an inch) to compensate when the car is going around a hard corner or carrying additional weight other than the driver.
I am using the widest tread width under my 951 without rub. if you want to play it safe use a size smaller.
If my post has an interest to you i will try and dig up the wheel adaptor size i purchased thru "Performance Product's", HR has the same adaptors.
G?L
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Old 06-19-2007, 08:33 PM
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Spook, Thanks very much. I should have a chance tonight to mount one of each of the rims to my car. The rims I bought are 23mm offset. I was led to believe this is the correct offset for a '86 951. If not, I'm hoping I didn't give away a set of adapters and extended lugs I bought for another 951 I had several years ago. Thanks again.
Old 06-20-2007, 03:12 AM
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