WannaC5Z

Due to the stock wheels being so light weight, I have purchased and extra set of Speedlines. No one sells the stock sizes in racing tires. What sizes do you guys run and where are you buying from? I prefer to find some scrubbed used tires for a discount.

ltborg

I know the guys in SS Solo competition who run Hoosiers use 315/35R17 and 335/30R18 and they seem to fit well. Not sure what the road race guys use.

charger21

Road race guys usually run 315/30/18 on all four corners. That's what I will be running on my Speedlines.

GT Racing Tires

We have several options for you depending if you want speed or longer life from the tires. Call me anytime.

Todd
414-350-6303

WannaC5Z

Really? Are there any rubbing issues up front? I am assuming that is on a full set of 10.5" rears too? I bought a pair of 17x9.5" for the front so I am sure that there would be too much roll/bulge for 315's on those rims.

hklvette

R-comps don't "roll/ bulge" like street tires do. You can really cram a lot of tire onto a narrow wheel with them and they still work.

WannaC5Z

True but I heard last year the NASA TX Vette competitors were actually running narrower tires on their rims and running faster times.

steponc

335s are too big for 10.5 rims

acrace

OP - autocross or track day usage? ltborg's suggestion is for autocrossing. While some folks use the 315/17 and 335/18 option for autocrossing, others use 295/17s up front and 315/18s out back. That's on stock size wheels (as mandated by the SCCA solo/autocross rules), although you can use spacers up to 1/4" per the rules.

Track days will be different.

WannaC5Z

HPDE track days

autoxer6

For track days and the stock wheels (17" front and 18" rear) I like 315 all the way around. That does remove the tendancy for the car to understeer so it is more lively (read more likely to spin). The car is definitely faster this way.

The 315 in front will rub a little a full lock, but that isn't a problem on track.

If you get two more 18" wheels, then you can use 315/18" on all four and rotate tires which in nice to get the most out of them.

ZedO6

Running 285/35-18 Nitto 555 RII's on 10.5 X 18 all four corners, track days. Car is very well balanced and I get zero rubbing. T1 bars, track alignment.

Nsomniac

Very interested in hearing more about this. I just got the car last year and it came with an extra set of stock Z06 rims with Kuhmo's on them. The Kuhmo's are 275/17 up front and 315/18 in back. I think the car was used more for track when they were purchased. I'm moving to Hoosiers this year, and if I can fit 315/335 on stock rims without rubbing or performance sacrifice, that would be excellent. Any help or links you can provide would be much appreciated.

Nsomniac

Eh, I mean 295's on the back. I had 315's on the brain.

WannaC5Z

I just bought a set of 305/660/18 for Continental Hoosiers for the rear for $100 each plus shipping. They have about 75% life remaining and look good. This is the same aspect ratio as the 275/40/17 up front I am running so all is good.