C2Spin

Any thoughts on 265 front and 325 rear? I heard of someone doing this on 19". 265s comparable to RS and wonder if grip as good or other front suspension mods would be needed??

orthojoe

You would have to match it up with wider wheels and fenders to accommodate them. Running 265 on 9" wheels on the gt4 has been popular, but I haven't seen anyone run faster because of them. A pro racer tried the 265 setup on the gt4 and doesn't like it. He says the tires are too wide for the wheel and more of a problem than a benefit, fwiw.

If you are going to try it, you would want to run at least a 9.5" wheel like the RS and see if it will fit.

Wooly1

265 front and 325 rear is really the ultimate setup for the 991 GT3 if money is no object. However, once you go to those widths, you are only dealing with a few tire choices (Cup2's, Trofeo's, Maxx Race, Hoosier) and those choices are very expensive and don't wear particularly well although their grip is generally very good. If money is not an object and maximum grip is what you seek, then that is the route to take. If money is a roadblock then you have to be a little more creative. Currently mine, and I believe Joe's, favorite setup factoring in price and grip is the 255/35/19 front and 305/30/19 rear RE71R's.

orthojoe

Agree and correct on my setup as well!

C2Spin

Appreciate the quick response. Yeah, I agree the tire wear on choices not great and the tires are not economical depending on number of days done in a year.

C2Spin

^^
Thanks for that info. I like that set up.

Wooly1

Your welcome. I have learned so much from Joe and others on the forum and now have done some of my own experimentation, so I am happy to pass it along as others have done to me. Best of luck with your setup and driving.

reidry

The RE71R on 19" wheels seem pretty affordable. Using Tirerack as the gage, RE71Rs are $450 less per set compared with N spec Cup 2s.

What's a reasonable set of 19" wheels run? $4k? 9 sets of tires would be the break even point.

Ryan

trakmor

I should make a small update:

1). A good buddy was kind enough to let me use his 19" forgelines on my car. In order to get them to fit, we had to swap out a toe link bolt. Oem part 99907353001. The car is riding on 255-35-19 and 305-30-19 Bridgestone Re71r tires. Overall rolling diameter is about 1" lower than stock, but zero issues with abs or esc. The car feels great. These tires are substantially cheaper than cup2, last longer, are more consistent, and they don't heat cycle out. I'm getting even tire wear all around as well. Love the setup. I only had one full session in the car with a bunch of traffic, but my 2nd lap out was 1:58 over the top at thill. I should be able to match or beat my best time of 1:57.4 there with these tires.

Sounds like the Re71r's are as good/better as the cup 2's? How about the overall grip level? Looks like the N spec cup 2's have dropped by almost $200/set from what I can see-weren't they just south of $2000/set last year(don't remember exactly)? Originally sure I was going to get a set of 19" rims, but am now starting to rethink it. They're really not heat cycling out? So you basically change when you see cords? Reading your post really has me looking for the 19" rims again! Would love to hear if you've had more experience with them since your last post, or anybody else for that matter. Much appreciated.

orthojoe

Based on my experience with multiple sets on the GT4, the grip level is equivalent to cup2.
However, the tire does not heat cycle out and are good until the tire cords.
Also, the tire is much more resistant to heat and is very consistent through the entire session. With the cup2, you have less than 5 laps to get a fast lap time down. With the RE71R, I've gotten some of my fastest laps on lap 2, but also on lap 12.

I'm a huge fan of RE71R.

trakmor

Great, thanks for the info. Sound like great tires! The fact that they don't heat cycle out is worth the cost of admission with the 19" rims. By 8-10 heat cycles with the cup 2's I've dropped 2-3 miles/hr through longer sweepers. I haven't seen cords in the last 4-5 sets of the cups 2's b/c of the drop off with heat cycles.

C2Spin

+1
Have the similar experience with Cup 2. You got me thinking hard about moving to this new to me 19" and RE-71 set up.

nxfedlt1

what rear toe settings are you all going with?

robmypro

Great thread Joe. I have a lot of reading to do!

C2Spin

Interesting new tires arriving from Pirelli. These tires have a chip inside them, The chip measures tire pressure, tire temperature, vertical load, tire wear, and the number of kilometers driven per tire. Pirelli says a future version will also estimate remaining tire life and act as a remote tire pressure gauge when the tires are being inflated. The current version also alerts the driver through the smartphone app when the pressure of one or more of the tires drops too low or when the wear limit is approaching.

Hmmmm....what's next....a chip for brake pad wear?

http://www.foxnews.com/auto/2017/03/...lk-to-app.html