mig7410

I plain on entering my GT3 RS in the Tire Rack One Lap of America. You have to use a 200 minimum treadwear tire.
I wish I could use the stock Cup 2"s but they are 180. My only option without changing to a 20" rear wheel is the Pirelli P Zero at 220.
We only have to do 2 sessions of 3 timed laps at each course. So you really don't have a chance to get the tire's hot. Mostly transit miles.
Most people use Michelin S4 for the event, I used them last year with my turbo.
You think I should go with the P Zero or put 20" wheel on the back to use the 4S. I really don't want to buy wheels for one event.

Serge944

disden

My biggest worry would be weather. Cup 2s are brutal in rain; as I've told you before I almost totaled my RS in a sudden downpour as they provide next to no wet weather traction. I would imagine the R spec is even worse.

dewilmoth

Edit: Disregard, thought the R888R were 200 treadware, but just looked and mine are 100.

85Gold

A/S

Buy a pair of 991 GT3 rear wheels, they are only 0.5" narrower than the RS wheels and you can get the same color and finish as your stock RE wheels. Go with the 345/30R20 MPS4s and same stock size for the front. On a 12" wheel, you only lose 5mm of contact patch compared to a 12.5" wheel, but you'll be running a 345 instead of a 325. In reality the 345 MPS4s on a 12" is the same width as the stock MPSC2 on the stock 12.5" wheel (I measured my stock rears at 13.75" wide).

OLOA does not allow any tire listed by TireRack under streetable Track & Competition (regardless of treadwear rating or OEM tires), and tires must be purchased through TireRack and tagged by them as well.

The MPS4s is shocking good in the rain (I have them in my 991 Turbo S), and OLOA pays good points for their first event.

mig7410

I actually have a 2018 GT3 also. So I could just put the rear wheels from it on my RS and be good to go with MPS4S?
That would be awesome.

evilfij

A/S

Done. You already have a pair of rear wheels in 20".

991.1 and 991.2 GT3 RS rear wheels are 12.5" x 21" ET48
991.1 and 991.2 GT3 rear wheels are 12" x 20" ET47

Be aware that while you run the GT3RS on GT3 rear wheels, if you install the RS rear wheels in your 2018 GT3, don't drive the 2018 GT3. As soon as you hit any bump on the road the tires will destroy your 2018 GT3 fenders (I tried this with my 991.1 TTS front RS wheels were fine, rear ones touch the fenders as my 991.1 TTS is lowered, I did not attempt to drive it at all but it looked pretty).

I only see 2 tire options for OLOA: RE71R and MPS4s. If dry all week RE71R, else Michelin.

SCCAForums

Mig, according to the TireRack site, Michelin now offers 21" sizes (RS Sizes) in the Michelin Pilot Sport 4S. So you can run your OEM 20/21" wheel setup for OLAO.

Best Regards,
Dave

sirtom

19" centerlocks
https://www.suncoastparts.com/product/19RSTTW.html

dsddcd

Try this out Mike, I think this is the perfect combination.



"

mdrums

i have a newer Zero N1 Spec on my 2017 GTS...on the road it is a lot better than the N0 PZero I had on my 2012 GTS. If you can go to 19" wheels...you should look at Yokohama AD08R and Bridgestone RE71. I also hear good things about the Michelin Pilot Sport 4 tires too.

dsddcd

Agreed, I just sold my 991.2 GTS Wheels and the N1 Spec tires were excellent. As a side note they appear to be wider than the NO Turbo Spec, I just took a photo of my Cup 2's on the GT3 wheels and my GTS wheels.