Originally Posted by flash68

Yes they did for the 4 minutes they were on the car! Now I am on my 3rd set of wheels/tires on the car in 24 hrs.






Thanks Mike, but yes I can tell you clearly have more space there. I wonder why 911GT700 has the same stuff but similar issues as mine?



Invoice from tire rack says:

18x8.5 ET53
18x12 ET51

I just ordered fitment for 996TT after seeing them on Graham's car (a GT2).

Originally Posted by MBailey

Cant imagine why? Are your wheels 18s or 19s?

Originally Posted by 911GT700

To be honest a little worried about rolling but might have to because of the non aggressive offset . I'm also going to the custom hard pipe.

Originally Posted by 911GT700

I will post some pics tomorrow Dave. It looks very similar to yours!!

Originally Posted by Mad Ness

"I" indicates the hub face. figures on either side are inches from hub to rim only edge. 315 over 295 - tires are 0.4" wider on either side in addition. Note these are rough indications only as manufacturers side wall or tread designs affect actual widths/clearance. Just use as guideline, then trial and error.

Stock 7.3" I 3.7"
New 8" I 4"

The new rim only is only 0.7" closer to the inner wheel well wall. The 315 tires are about 0.4" wider on each side over stock. I believe diameter increased as well (30 over 315 vs 30 over 295). So together that's 1.1" decreased clearance, diameter increase not factored in.

Put the car down, gauge how much further outwards (away from car), the wheel can be shifted with out causing issues on the fender side. That should indicate max. spacer size. The additional increase from both offset and width (both wheel/tire) is net 1.1" and thus from crude back of envelope calculations, would require a roughly 28mm spacer to line back as stock. Note, the new rim/tire is already 0.7" closer to outside fender.

Just did these calculations quickly so please just use as additional info only and check it.

FYI just in case that hasnt been factored in. i believe the front/rear over all diameter ratio has to be with in a certain range for the AWD to function properly. I can't remember what that range is.

Originally Posted by flash68

My new OZs are 18x12 on 315/30/18, and old HREs were 18x11.5 on 315/25/19.

Originally Posted by MBailey

Dave, I am not an expert on this tire/wheel size/offset topic but the only parameter where you are currently larger between your new setup, your old setup, and my setup is the width of your new rear wheel. I have an 18x11 rear HRE. You had a 19x11.5 that worked. Perhaps that last half inch of wheel with a bigger tire is a little too much?