MarkAVette

There was a post on running 335 square on a c6 GS. What about 315/30/18 square on 11 inch rims (or maybe 12) with R compounds for stock suspension with a track orientated alignment at the advanced solo DE level? Looking for something simple without having to worry about rubbing and 315 r888r are a pretty good price. The 11 inch rims and tires should be less weight and the GS has stock power so not as fast as a Z06. Would running square 315s with an alignment like -2 to -3 front, -1 to -2 rear give a good balance? I'm open to updating sway bars also if that would help.

The more traditional 315/335 is also an option. Do you guys running different rear sizes find that the front and rears wear about the same?

Thanks,
Mark

Dirty Howie

Have read a lot and heard 1st hand from many drivers who say the R888R is trash. I have been using the NT01 which I think is great and never heard anything bad about.
And they come in 335 and 315.
Also I think fronts always wear more/faster than rears.


DH

STANG KILLA SS

ive run both. i ran a square setup on my camaro and loved it. so assumed the same for the vette and ran square at first. boy was i wrong. i had to tip toe threw the corners and wait sooooo late to get back on the power. ran 315 square.
switched to 315/335 and was immediately better. so much faster, and more stable. and i can get on the power much earlier and drive alot more aggressive. (track)

the only scenario i would consider running square now, would be a really small autocross. and i still think i could be faster with the bigger rears.

i assumed fronts would wear fastest, but i always wear the rears first. every set.

i HATED the R888Rs. so terrible. been happy with the bfg Rival S. and have a set of NT01s on the way to try for the first time.

i ran the square rival 315 on 10.5" rims

i run the 315/335 on 11" and 12" rims.

C5inWV

I have a set of GS wheels for sale in the C6 parts forum. You can probably find a set up that works for you, like 295 fronts and 325 rears.

Dropspeed

I just ran back to back on the two combos I had this weekend at Grattan:

I had R888s (295 on 18x10, 335 on 18X12) and was not a fan of how they felt on the car.

Not a direct comparison as I up the front wheel to 18X11 w/315 and rear I still have an 18X12 w/335 NT-01. I like the car much better this way.

I ran two session in the morning on the R888, swapped to the NT-01 and the car ran about 3 second faster (Grattan: 1:25s / 2.5miles long) NOW, the sun came out as well so the track got warmer......

I ended up selling the R888 /OZ wheel and tire combo too a newer driver at the track and he was very happy after he drove on them compared to his Michelin PSS on stock wheels.

-Matt

MarkAVette

I used RA1 which I really liked, r888 which I never liked at all, r888r a couple of times now and they seem to work better than the r888. I'm happy enough with the r888rs. I will probably try the NT01s on the GS as I have heard good things about them. They don't have them in 245 which I run on my current track car.

The C6 Z06 has more power and I've heard they are twitchy. Does the GS handle the same way?

Hoping to get more input from folks who run square and those who have run both. As of now, it sounds like a 18x11 w/315 front and 18X12 w/335 rear is the safest bet as far as fit and handling. Have some time before I need to buy.

Thanks,
Mark

Craiger77

I run the same wheel and tire sizes and really like it so far. I have the r888r’s right now and it’s a 07 z06.

AJ02

Cars an '11 GS. I do run 335 squared on an 18x12/18x13 setup. Car doesn't feel twitchy, but you can tell there's massive front end grip. I've had other Vettes running behind me who can tell that I simply out steer them through corners while they have to throttle steer more. I'd probably suggest an 18x11 upfront with any street driving as the 335s do require some "self clearancing". No issues on track, but parking lots do require 3 point turns...rubbing at full lock.

PRE-Z06

I saw a C6Z06 at the Pro Solo this weekend with 315 Rival on 18x12 in the rear, had a 275 up front. He chose it for gearing and the 315 looked fine, not streatched like my 305 on 19x12. With that being said I’d go 315/11” and 335/12” unless you’re wanting to try and rotate them as there’s not much difference in price. I ran 275, 295 and 315 square on my C5FRC and finally 315/10.5 and 335/12 which I liked best. You might look into the A052 in 315/30 as it runs fat with 12” of tread if wanting to go square, though a little more sidewall in the rear will make it less twitchy and help put power down better as someone in the past ran 17s in the rear and 18s in the front on a modified C5Z if I remember correctly.

chetly

I can't imagine running a 315/315 set up on the car would be balanced at all if you're adding that much front grip and taking away rear grip. Even C5's respond better with a 315/335 setup, no way I'd run a C6 that way.

PRE-Z06

If the 315 is actually 12” of tread width, then you’re not really taking away grip and if the overall diameter is 1” shorter then you’ve given even more grip to the rear being you’ve helped weight bias no?

smitty2919

Well I suppose you mean running 315 square on a 100% stock car. Once you mess with adustable shocks and or add swaybars you change the initial balance of the car as it was designed.

The most common setup I see is a Vansteel or Strano front adj bar, 315 square and Koni SA shocks (in terms of autocross that is). Of course there are AS guys needing to keep the 275/295 combo. But I/m confused why you say "adding front grip and taking away rear grip". You are increasing tire width front and back from the stock sizes, although the front is getting a bigger jump in width.

chetly

Because the OP's question about a C6 GS which stock sizes are 275/35-18 and 325/30/19. So going to a 315/30-18 f/r setup would infact add front grip and reduce rear grip....

chetly

The 315 may be 12", but what is a stock 325-19 or 335-18? And while you'll get better weight transfers to the rear with a shorter tire, you're also taking away linear contact patch which helps with acceleration.

PRE-Z06

315 A052 is 12.0”
335 Rival is 12.1”

A052 comes in a 295/30R18 if you want to run it on an 11” rim for some stagger and it’s 11.2” tread width. If it doesn’t spin, the shorter/lighter tire will accelerate faster.