I think you ar going to ruin the AWD of your 996TT. The rubbing is probably the least of your trouble.

 

Toyo T1R come in both sizes you need. I'm on my second set and am very happy with them as street tires - they're also relatively inexpensive...

 

Ok, so I think I figured out the diameter/revs situation and found the best value sizes. Please tell me why this combo would not work from TireRack, in terms of performance (street) and profile looks. Again, my car is a 2002 996tt, and the rims are off a 2007 19'' 997.

My new 997tt 19'' Rims off a 2007 sizes are:

Front: 8.5x19''
Rear: 11x19''

Best value tire sizes from TireRack:

Front: 225/40/19 Hankook V12 - $151 each - 26.1'' diameter ; 796 revs per mile - says fits 7.5-9'''

Rear: 295/30/19 Hankook V12 - $206 each - 26.0'' diameter ; 798 revs per mile - says fits 10-11''

That's a damn near spot on perfect match for about 30% of the price of what 315/25/19 will cost. Assuming I'm not missing something, why in the hell did the three Porsche dealerships and four calls to Tire Rack not suggest this when I asked if there were any potential combos like this available?

ETA: No go b/c its supposedly too tall and will rub in rear.

 

would 305/25/19 work as well as 315/25/19?
how does 295/30/19 work? shouldnt that be a different diameter due to the 30 profile?

 

Depends what you are matching it with on the front. The RULE I'm told you need to be within 3/10 of an inch diameter from front to rear in order to keep your differential safe. The wheel revs are always going to be closer the smaller diameter is, so just focus on diameter. Let me know if this makes sense.

305/25/19 has a 25.1'' diameter and 828 revs per mile, so you need to find a front tire with ~24.8'' to ~25.4'' diameter. (this is my take on it at least). However, you don't want to do this b/c the only 305/25/19 is a $538 Pirelli PZero, no thanks.

You can see these specs at tire rack for all the different tires. Click on the tire, then click "Specs" tab and it will tell you. Keep playing with the different rear and front sizes until you get within the 3/10'' diameter difference for front and rears, the wheel fits your rim width size, AND find the tire set in that selection that you are comfortable buying/using given price/performance. My goal here is to avoid paying $550 per rear tire.

 

Apparantly forget this, since now I'm told 25.5'' is the max height (diameter) the wheel can be or there will be rubbing. Again, the stock rear on the 997 19'' wheel is 305/30/19, which is 26.3'' diameter, so not only too tall, but way too much ratio difference with the front for the 996'' diff to handle.

You need 25.5'' diameter or below, AND within 3/12'' inch diameter difference in front and rear wheels.

This is really pissing me off.

 

Will 235-255 40 19 rub the inner fender liner wheels turned full?

 

I'm told anything with a diameter 25.5-26.0 is possible to rub and anything 26.0+ diameter. So yes, all of those are all way over 26.0'' in diameter and will certainly rub the 996.

Remember, stock size for the 996 is 225/40/18 which is 25.1'' in diameter. When adding an inch to the wheel size for 19'' wheels, you are pretty much going to need a thinner aspect tire in order to say below 25.5'' diameter and avoid the risk of rubbing.

 

I've had these on for 6 mos. and 6,000 mi. with no problem. Fairly aggressive street driving (we have very bumpy roads here) and one track day. No rubbing.

That said, I will not buy Hankooks again. They started making noise (droning) at only about 3,000 mi. They are also not as sticky as the PS2's I had before (which I expected though).

 

Do you mind taking some pics of your rims and tires, im am curious to see how that tire combo looks,are you running 8.5 front and 11 in the rear? Thanks

 

Here's my 996tt with 997tt wheels on (see my tire comments above), and more pics can be found in my thread about half way down the fist page: https://www.6speedonline.com/forums/...che-turbo.html

 

I almost think they look better on the 996tt than the 997tt. Hmm, I wonder if the turbo twists would look better on the 997tt

 

Anyone need a set of 997 TT wheels/tires + RSS 7/15mm spacers (3months old)? I have a complete set in perfect shape _ and I mean perfect for sale for $2500 + shipping or if you are around NJ, pick up.

These are from 2008 TT with 6k miles. Tires are in great shape too.



https://www.6speedonline.com/forums/...ires-tpms.html

 

Mike, I read through this tread, what tires did you end up going with your 977 tt wheels? Any issues thus far?

 

Yep, I've had some PSM issues since doing this. Not the end of the world, but its annoying at times. It is likely a mismatched/missized tire issue, and not the rims problem (since lots of people have 997tt rims without problems). Read through my thread, there is some discussion there: https://www.6speedonline.com/forums/...che-turbo.html

Here's another owner who has the same 997tt wheels with the same PSM problem, and I've posted more there with other links: https://www.6speedonline.com/forums/...-psm-help.html