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Tire Gurus - Need confirmation on fitment

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This should be a relatively easy one - I am buying new rubber for aftermarket rims on my 01 996. The existing tires were put on by the PO and I don't believe they are the optimum size. The aftermarket rim sizes differ a little from OEM and are the following:

Front: 18 x 8.5 - 52 mm offset

Rear: 18 x 10 - 63 mm offset

Would you recommend I still go with the OEM tire sizes (front 225/40 and rear 265/35)? Thanks in advance for your response -


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It has been suggested that I bump up the sizes to a 235/40 in the front and 285/30 in the back. There seems to be disagreement as to whether the 235/40 on a 8.5" front rim will fit. Any thoughts? Thanks again in advance.

Edited by JeremyW

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996 mk1 stock size is 225/40/18 on 18x7.5, 265/35/18 on 18x10

996 mk2 stock size is 225/40/18 on 18x8, 285/30/18 on 18x10

996 mk2 widebody stock size is 235/40/18 on 18x8, 295/30/18 on 18x11

other sizes that will fit include

245/35/18 / 285/30/18

255/35/18 / 295/30/18

believe it or not, any of the above sizes will work on your aftermarket rims.

what size depends on what you're going after.

if you want better gas mileage, go thinner (e.g. 225/265)

if you want more comfort, go higher sidewall (e.g. 225/40 and 265/35)

if you want better traction, or appearance on the rim, go wider. (235/295)

if you goto the track or autox, try my alternate sizes.

good luck.

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