MattB

I’m looking to step up to some R-type tires this year, and hope to be in NASA’s TT at least a few weekends this year. Last year I used Kumho MXs on my C5, and liked them, but would like to step up. The stock Kumho’s have a diameter difference of almost exactly 1 inch, the rear being larger. In looking for tires, I have a set of C5 Z06 wheels to use as track wheels, I notice that there may be only one set of tires that would preserve the rake, the Kumho V710s with 275/40R17 and 315/35R18’s. The others that I’ve looked at would either be pretty close to the same diameter front and rear, or actually be larger diameter on the front in the neighborhood of half an inch.

How important is it to preserve the rake? Will a large change in rake effect the suspension geometry? I’m not sure if I want to adjust the ride height each track weekend, but I guess that is an option. Any other clues? I looked at the NT-01’s and they look like they would be about the same diameter, the pilot sport cups would be bigger in front.

What do people usually run on C5 Z06 wheels?

Thanks for any input!
Matt

AU N EGL

tires can be same diameter or slightly larger in the rear.

Ride height should be close to stock or no more then 1" lower then stock. about 1/2" lower is ideal. This way suppension can still travel.

Slammed cars look cool as heck, but dont perform for chit especially if you hit a gater in a corner.

TedDBere

Kumho 710s: 275/315

Hoosier A6s: 295/315

You can always adjust the rake using the rear bolts, FWIW.

Good luck.

RichieRichZ06

I run those exact tires on my car and they are great (V710's). The only drawback is the wear. On a good weekend of tracking they are completly toast if you drive hard. If you can afford to buy a new set every couple of track days, IMO there is not a better tire out there. I went from the Nitto RII's and would never go back to them after running the V710's.

wtknght1

Don't start screwing around with adjusting ride height/rake, etc unless you have a set of scales and really know what you are doing. It's easy to ruin the handling of these cars if/when you start messing with the ride height.

MattB

I agree, but thats why I'm asking, I don't want to cause a lot of probelms and I don't want to try and set the ride height when I swap wheels. What type of issues can come up if I go with tires that have the same diameter?

Anyone use the NT-01's on Z06 wheels?

Thanks,
Matt

wtknght1

We run 17" wheels all around in T1 and it does just fine (275s/315s for me). Some guys run 315s all around - no issues.

If you don't want to run 17" all around, just buy whatever size tires that fit on your rims...but don't start monkeying around with the spring bolts. It'll be plenty fast enough!

mountainbiker2

Go with Toyo RA1 tires. 275/40/17 305/35/18 You can drive them on the street and do track days with them.

Steve

C6400hp

wtknght1

If you are driving the car to the track, then don't use the V710s. It only has 2 grooves and would be no good if it rains. If you're driving it to the track, the good 'ol Victoracer is still awfully good!!!!!!

MattB

I have a set of Z06 wheels to be track only. I stuck with the MXs last year because I did not have a set of track wheels.

So, no worries

I think it will be the V710s if I don't hear any good suggestions this morning

earthman01

I run Hoosiers (R) on stock rims when its dry, Kuhmos when its wet. The Hoosiers make a BIG difference.

Canam

I agree. Best R1 compromise tire there is. Very long lasting. We use them as spec up here in Canada for road racing. They heat cycle continuously and never give up. Their not the complete fastest R1 around though but pretty good.
I also agree with not screwing with the car. Use the stock sizes if you can and maintain the stock geometry (ride height). Your corvette was totally designed to run optimally at this height. These are race bred cars. You don't need to do much to them in fact if you do you could make the handling worse, not better. Make changes later when you really know the feel of the car