deputydog95

I can't seem to get any straight answers out of Kumho or Tire Rack believe it or not. Nobody can confirm which tires have which profiles. I finally asked Damon to got out in the warehouse and put his hands on a set.

The tires I assume would work would be the following

305-30-18 (not even listed on tire rack)
245-35-18

I'm not what the deal is. The rear in this combo appears to be .4" taller than the front so it would be within ABS tolerance.

I find it odd that TR doesn't have the 305 listed, and even odder that Kumho doesn't list what the sidewall profile is on there site.

Can the squares be mixed safely with the rounded if thats the way it works out for availability? They are the same compound and tread design.

deputydog95

The 315 and the 245-40 appear to be a possibility too. But I'm not sure how the 315 would fit out back. I run 315 in the hoosier but it appears to be narrower than the 315 in the V710. And then I'm back to the question about rounded vs square profiles.

brownan

I went through 3 sets this season. Like them a great deal. Manage to get ~23-25 heat cycles through them before they start to really go "off". I'd like to cord a set next year just to see how long they last. I use the square shoulders in the front and the round shoulders in the rear. 18" for .2RS application. Unless I am wrong they make a 325 for R and a 245 for F.

NJ-GT

315/35R18 will fit, but you need to get stiffer springs and remove the rear spacer, it is taller than the 26.4" on Kumho specs. If you don't get stiffer springs, remove the rear liners and trim the 0.5" lip that goes around the wheel well.

Without modifications, 315/35R18 V710 will rub on any 996/997 GT3 using stock offset/width wheels on 18" diameter.

Already posted the sizes that work for you. Already posted about round/square shoulders. TR has always listed V710 305 since 2007.

NJ-GT

The rear is a 315/35R18, but it is actually very wide, it should be called 335/35R18.

Correct, they last 50% more than the R6. I get 16 HC on R6 and 24HC on V710. V710 lasts longer than R888 and when they go off, they are very progressive. Unfortunately, no front size in 19".

R6 has more forward traction (accel/brake), V710 corners better. A6 beats them both.

deputydog95

Sorry I missed that Rad. I'm getting a little turned around. If I miss a couple days I lose track of my place. What thread was that?

deputydog95

Never mind. I found it. Not sure how I forgot that one. I'm as foggy as a Venezuelan who just flew into the US after an all night flight and drove to Sebring

https://rennlist.com/forums/997-gt2-...re-size-2.html

mkozink

I will be using 18" V710s on a 997.2 RS this season. The sizes have already been mentioned (245/40R18 & 315/35R18). The 18" Kumho's are virtually identical to the 19" MPSC's that come standard on the RS. They were recommended by other Rennlisters so I am looking forward to evaluating them on track.

deputydog95

I'm still trying to get definitive answers about camber settings on these tires, especially when running rounded fronts and squared rears.

M3EvoBR

test it .... you will get your answer in a few days, checking wear and tire temps at the track

NJ-GT

camber settings are the same whether square or round shoulder.

Cars with limited camber adjustability (Carrera, Boxster, Cayman) need to use round shoulders.

Cars with any camber adjustability can use round or square shoulder. Preferably use square shoulder because you get a bigger contact patch.

For a given size, the two molds are not available, some sizes are available in round shoulder only, while others on square shoulder only.

V710 sizes for the 997.1 GT3 are 245/35R18 and 305/30R18. Any other sizes require modifications to the car. No ABS issues with them.

V710 work well with -2.5 degrees in a 996 GT3. 997.1 and 996 GT3 use more aggressive camber. The 997.2 GT3 and RS tend to cord the inside edges with aggressive camber.

Generally, the V710 requires the same camber as Hoosier R6, but the V710 runs at lower pressure. I ran them at 26 psi front and 30 psi rear hot.

Become friend with your tire installer, and tip him well, because V710 are among the hardest tires to mount.

deputydog95

You're a big help as usual

So with my car (.1 997), I have to run round fronts and square rears from what I can tell based on tire rack's specs.

I'm ok with the same camber settings I'm running on my hoosiers (-3 front and -2.5 rear)?


A

deputydog95

I just re read your post. If your running 26 and 30 hot, what temp are you coming out on? 16 and 20???

mdrums

Andrew...I believe the Kumho's have a stiffer side wall thus you should run less camber. Only a pyrometer will tell you if you are over heating a certain part of the tire.

There are some $100 pyrometer out there...I added 1 to my Christmas list!

NJ-GT

Correct, a round shoulder front and a square shoulder rear, because that's what's available in the 245/35 and 305/30 x 18 sizes.

No need to change your camber. -3.0 front and -2.5 is actually a nice setup.

Start at 22 front and 28 psi rear cold, and let them go up to 30 front and 34 rear, then check temperature and pressures, and adjust down. I ran them at 26/30 with a light car, your 997.1 is heavier so you might have to run them at 28/32. They like lower pressures than Hoosiers. I run my Hoosiers in the low 30s.