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Will 285/35-18 fit a 99 996 C2?

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YOUR RESEARCHWill 285/35-18 fit a 99 996 C2?

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Install some ps2 tires and was considering 295/35/18

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I just installed some PS2 tires and was considering 295/35/18 on the rear, but went with 295/30/18 in order to stay within the +/- 3.0% of the 285/30/18 size.
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Will 285/35-18 fit a 99 996 C2?

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Install some ps2 tires and was considering 295/35/18

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I just installed some PS2 tires and was considering 295/35/18 on the rear, but went with 295/30/18 in order to stay within the +/- 3.0% of the 285/30/18 size.
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Will 285/35-18 fit a 99 996 C2?

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POST 1 / ORIGINAL POSTEROriginal post

A local tire shop has a pair of Falkens 285/35-18 that he will make a smokin' deal on. I previously had 275/35-18s, which were fine, but I'm not sure about going up to the 285s. Any thoughts on whether these will fit are appreciated. Thanks

POST 2Original post

Yes, they will fit. However, stock OEM size is 285/ 30 /18. The diameter of the 285/ 35 /18 is 4.34% larger than the OEM tire size and most tire manufacturers state that you should stay within 3.0% (+/-) of the original tire diameter. Your current tires (275/35/18) are 3.29% larger in diameter than OEM size and the 285/35/18 you are looking to get are 1.09% larger than your current tire. I just installed some PS2 tires and was considering 295/35/18 on the rear, but went with 295/30/18 in order to stay within the +/- 3.0% of the 285/30/18 size. Check out this link to a tire size calculator. http://www.1010tires.com/TireSizeCal...?action=submit

POST 3Original post

I just did some research on tire sizes and feel a need to re-activate this thread. Tim, the link to the tire diameter tool is great and your explaination is correct if you take the 285/30/18 tire as basis. However, according to our owner's manual (at least for the MK1 996) the OEM rear tire size is 265/40/18. When you put the 265 tire as basis in the calculator, the 285/30/18 tire is 2.26% smaller in diameter and then 285/35/18 is 2.13% larger, so both tires are within the +/- 3% tolerance. If you compare the tires to the front tire size of 225/40/18, then all 3 tires are within the 3% tolerance although the 285/35/18 is with +2.98% right at the border (265/35/18: -0.87%; 285/30/18: +1.4%). So both 285 rear tires seem to work but Porsche did obviously prefer to suggest the 225/40/18 + 285/30/18 combination.

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