85Gold

If your chasing Lap times then Hoosiers or Slicks are your Droid.

Peter

krell

Well yes, there is that, but I don't have a way to get slicks to the track.

38D

Cup 2s are a very good balance of grip vs. longevity. We run them in AER endurance racing on a GT4 clubsport and they work very well, the longest race being 14 hours on a single set. There really is no magic tire that lasts a long time and has amazing grip. Michelin slicks are the bomb for about 2 Heat Cycles, Pirellis are more consistent up to about 5 HCs, then Cup 2 Rs or Hoosiers, then Cup2, etc. My old Viper ACR had Kuhmo V720s that literally corded after 2 runs. If you are already getting 10 days out of a tire, that's really really a long time for a car as fast as a GT3.

Manifold

I estimate that I'm getting about 15 hours out of the Cup 2, so not much different than you. Most of my track days are only 1.5 to 2 hours on track per day.

You guys were right that Supercar 3R is not available in 255/35/20. So I decided to give the Supercar 3 a try, since they're available in the correct sizes, much cheaper than Cup 2, and are reported to last longer than Cup 2. Not happy about going slower than Cup 2, but we'll see how big the difference is.

Niez66

If these tires on going on the rear of a 911, especially a GT3, the load rating is not the same. Goodyear is 99Y and the Cup 2's are 103Y.
I'm not certain how big of a difference this is, rear engine cars I decided to stick with tires in the same load rating.

Manifold

I'm not really familiar with load ratings, but best I can tell, the 99 can carry 1709 lbs per tire, and the 103 can carry 1929 lbs. If I understand those numbers correctly, the load capacity of the 99 is far above the load on the tire.

SterlingatBOM

Anyone running 19s tried the Conti ExtremeContact Force? Supposed to be an endurance track tire. Might be great in the Texas heat.

Jim Cobb

Thanks

veritas55

I just got a 991.1 GT3 and am starting to track it.
I got the Apex Racing 19" set and am running 265/35/19 and 325/30/19.
I am running Hoosier R7s.
So far, I love the Hoosiers -- don't love the price.

I may try Cup2s as a comparison.

How far of a performance drop off are the Nankang's AR-1s. Curious about folks' experience?

SterlingatBOM

AR1s are a bit quicker than Cup2s but in my experience don’t last as long. Hoosiers to say better in the Texas summer heat at COTA than any other DOT tires. I’ll find out how long they last.

Snyper886

Last few seasons I went through a few sets of Cup2, but found they didn't last very long and ran into delamination issues. This season I tried both CR-S and AR-1. Both tires are very comparable to Cup2 in grip, but I think Cup2s provide better steering feel, especially at turn-in. I prefer AR-1 over CR-S as they provide more grip, and tire pressures don't skyrocket like CR-S. With AR-1s I'll go out at 27PSI cold and they'll get to about 32PSI for 3-4 hot laps, then peaking at 35PSI if I'm continuing on. However, with CR-S, I spent much more time managing tire pressure; out at 26PSI cold, good for 2-3 hot laps at 32PSI, then they'll just keep building pressure quickly, getting to 40PSI eventually around lap 5. Just for this reason alone I'll stick with AR-1s; I'm 15 heat cycles in and they're still going strong. Yes they are loud tires but definitely quieter than Toyo R888. I drive them to/from track (1hr each way) and in the city when track events are close together, but never in the rain. CR-S is good for city and AX or time trial and possibly wet weather, but wouldn't recommend for HPDE as you'll need to cut sessions short. Also, CR-S tire pressures don't drop quickly, so you can't really back off for a few laps then go hard again. Once they're above 35PSI, the session is over.

RossP

Trofeo Rs are a good option.

NHmacan

Is anyone finding stock for rear tires for GT3s? Cup2s don't show stock until late September and the Dunlops don't show any production, the best estimate is 3 months.

TET GT3

Have you checked with dealership? They tend to have them in stock or get them quickly.

NHmacan

I checked with the dealer on the Dunlops and no Joy. I can ask about the cup 2s.