Road Runner

Anyone have expereience with using 9x18 and 11 or 11.5x 18 widths on a 993tt? if so What offsets? I have been told by a wheel seller that I should limit width to 8.5 and 11. The car is lowered (coil overs etc). Will 245-35 and 315-30 tires be suitable? I do not want to have fender rubbing issues or have the tires "stick out" past the fender lips. Thanks

adsc4s

I have a C4S that I am running 8's and 11's. They are the stock 996TT wheels. 225's in front and 295's in the rear. Seeing as the 295/30/18 is factory on the 996TT, it sounds like going to a 315/30 and 245/35 is increasing the diameter both front and back. I'm not sure that's a good thing but other will know.

When you are getting to tires this wide, offset is critical. I know David in LA has 11" Gemballas on his 993 NB so it should be possible to go to at least 11.5", if not 12" in a WB. Again, others with more knowledge/experience will know.

David in LA

If you are willing to roll your fenders you should be able to fit 12" or maybe even 12.5" on a widebody 993. Check with Kinesis, HRE or Fikse as they do custome offsets. ViperBob is running 315s on the 996TT Twists he has mounted on his 993TT.

Keep in mind that in addition to fender/suspension clearance you have to be mindful of any significant circumference difference between your front and rear tires as you may demage your 4WD differential. Increasing to 245/315 will cause your car to understeer a bit more; this can be dialed out if you have RS swaybars

Also different manufacturers may have different tire profiles - so a 315 from one manufacturer may have the same width as a 295 from another. I found that a 265 Goodyear F1 was the same width as a 285 Bridgestone SO2.