997gt3north

The 245/40 and the 275/35 are both 25.55 inches in diameter.

The 315/30s are 'only' 25.35 - ie shorter than both potential fronts.

If the 245s work (if), then the 275s should work.

I'm sure daily driving would likely not be an issue, but I would hate to hit a brake zone at speed and fine out otherwise.

Safe way to try it is to do a lot of testing on the street with no one around and space to fix a problem if a problem arises.

Given that 911s generally run higher rear psi, this might help a little with the diameter issue - might.

jbxea1

I went through 3 sets of R6s on my 2010 GT3 last season. I ran 235/35s up front and 315/30s in the rear. Car feels very well balanced with lots of grip, and these have become my primary tires. I also drive about 45 miles to the track on the R6s if the weather is dry. I like MPSC also, but switched to Hoosiers because they have better grip and are cheaper. MPSC are better road tires, but the GT3 has become primarily a track car for me. On the track, I get about the same number of cycles from both the cups and Hoosiers.

________________
2010 Black GT3
2008 Silverstone M5

kyrocks

Yes, sir.

997gt3north

I actually had my PSS car out for a winter drive at 0C with very slightly wet but cold roads. I absolutely didn't push the car but they were 200% better than the OE cups would have been.

From an all-round tire perspective, the PSS is an amazing tire

GentlemanRacer

You probably meant 1:32.

997gt3north

It was 2:32 backwards

You would think I would know that after all those laps

Dreaming of the re-start of track season from cold hockey arenas

mdrums

Go with the 255/35/18 and 315/30/18 R888...they fit great. I used this set up for a long time on my 997 Carrera S...they will fit the GT3 and this is the size I see most around here for R888 on GT3's.

sin911

^ Mike, any reason to choose the 255/315 combo over the 245/305 combo? I know it is smaller in diameter so lower gearing but any other reasons?

997gt3north

- Car will ride about 1/2 inch lower (lowered CG) with the 255/315 combo
- the 305 and the 315 from the specs are about the same width but the fronts 255 are about 1/2 wider than the 245

The above 2 points (wider front and overall lower car) favor the 255/315 setup. The only factor that may favor the 305 rear tire is that it is a 35 profile tire versus a 30 profile for the 305. I say may because some people may like more sidewall from a feel perspective.

I have had a ride in a 255/315 car and the balance is very good.

deputydog95

r888's blow. waste of money. i have used them as street tires for the past 10k miles because they became solid as granite after 5-6 track days. they look brand new still

how in the world would we fit a 275 up front? and what would be the point? its still taller than the 315 rear nitto offers?

and why is no one considering the kumho's? A) they fit B) they are priced right C) they offer grip comparable to a RA1 or better D) they fit E) they are good for around 6 full days F) they fit

LVDell

Andrew, which Kumho? Thx

utkinpol

he probably meant v710 with no grooves for rain water to escape = no street driving.

there are also kumhos exsta xs but i have no idea what those are.
http://www.kumhotireusa.com/tire/cat...7-2BEA0466BD5C

LVDell

I am going to run the first couple events on my Pirelli Corsa tires and then when they are toast I'll start sampling some of the "entry" level r-comps (i.e., NOT R6). Hopefully, Nitto will start to fill that demand of larger diameter tires that the 7GT3 crowd needs. I won't hold my breath though

deputydog95

Yes, V710. Good tire. Nitto isn't going to make our sizes so I would just give up on that....

johnboise3

In my ecperience, the R888 heat cycles out much earlier than the NT01, and when the R888 "goes", it happens at once.