JWERION

I am looking for some input from people with experience driving either of the tires listed below or better yet people who have tried both or some other brand all together. I need a tire with a maximum section width of 12.0" in the front and 13.75" in the rear tomeet the SCCA GT2 rules.

There are few race tires that iam aware of that are made this wide in an 18" rim.
I am looking at the Hoosier radial R3S05 rear in 335/30 ZR-18 DOT and 295/30ZR-18 DOT front. I am also looking at a set of Pirelli P-Zero race slicks in 325/650-18 rear and 305/645-18 front.

I have been driving on Hoosier biasply 16" slicks and have decided to change to different brakes and 18" wheels. So any advise or insite into tire selection would be appreciated.

Geoffrey

You may try Michelin in 27/65/18 front and 30/70/18 in the rear. If you need to stay within the 25.5" diameter, the Pirelli is about all you can get in a true slick. If you can accept the larger diameter of 27 to 28", then the 695/700 profile will give you some additional choices. The larger profile gives you better loading characteristics needed for the heavy rear engined Porsche.

Larry Herman

Having run both on my GT3, I can tell you that out of the 2 choices you list, the Pirelli slicks are the way to go. They are faster, probably by a second on a 2 mile track, and will last longer under racing conditions. I also found that the performance does not seem to fall off during the course of a stint. One thing though, they are a real bitch to mount as compared to the Hoosiers. That being said, sizes being similar, slicks made by Michelin (I have driven on them) or Dunlop (as per Norm Goldrich) will be faster and the Yokohamas will be equal to or slower than the Pirellis (based upon what a friend of mine said who tried them).

JWERION

Thanks Larry & Geoffrey for the information. I will start with the Pirelli's and try to find some Michelin & Dunlop slicks to try later.
Do you know of a supplier or website that sells the Michelin and Dunlop slicks? The websites for Michelin & Dunlop do not list any of their racing tires or distributors for the same.
Geoffrey Why does the higher profile tire work better in the rear? What loading charichteristics are you refering to? and are you suggesting a higher profile in the rear than in the front? Sorry I am fairly green when it comes to racing and setup.

analogmike

You want the Michelins, there is one place that sells them in the USA, they have a web site with sizes too. Sorry no time to look them up. There are three compounds, normally one compound softer is used on the front of a 911. The non-GT3 Cup tires are a good deal and softer too (your car will be a lot lighter than a cup car so should run softer tires).

Mike K.

I just purchased my first set of Michelin slicks for a street GT3. They were cheaper than a set of MPSC s so I thought I would give tehm a try.
I bought the S7A Michelin slicks instead of the S8A. Can someone explain the differences besides the fact that they are 2/3 the price. I am thinking of ordering another set for the 48hrs. Thanks.

JWERION

AnalogMike, When you have time can you please post the website of the dealer for the Michelin race slicks? I can not find anything dooing a Google search. Thanks Justin

A930Rocket

http://www.subesports.com/products/cat/Tires

Mike K.

I bought the Michelin Slicks from JD Motorsports of Greenville SC . Ph. # is 800-722-3234 and paid a lot less then is listed on the Sube site.
Installed prices at PBOC at Sebring
24/64-18 S7A $ 237/ tire
27/65-18 S7A $ 250/ tire


My Question is what will happen running the softer S7A in the rear instead of the recommended S8A?

analogmike

I posted before seeing the above post, will edit this...

I didn't know Sube Sports sold them, I get them from the dealer who supplies the IMSA GT3 cup, JD motorsports in SC. http://jdmotorsports.com/

The CUP tires are S8 front (medium) and S9 rear (hard). These are required for IMSA GT3 cup and other supercup series. They hold up really well on these heavy cars. The S7 (soft) and S8 (medium) sets are cheaper, seem to be the same construction. Best for use at lower track temperatures or on lighter cars. Or lighter wallets

I didn't know they made the rears in S7, they would be awesome for autocross! But I doubt they would last for an enduro. Let us know what you find out.

Have fun!

Sam N

I believe that Sasco Motorsports also sells Dunlop slicks. They have always been helpful when I have called to check on tires.