Roadcourse Tires & Wheels

[JCM]

Once I have it broken in, I am taking my car up to Summit Point Raceway for some track time. This is a 2 mile, 10 turn road course. I ran my 'stang with R-1's on it and need info for the Z06.

Does anyone have any experience with the GY formula 1 tires in terms of wear and handling?

Does anyone run a 17" wheel/tire combo on the track? If so, which wheels and tires?

Would the additional flex of the added sidewall of a 17" tire ( assuming the 17" has a less steep aspect ratio to maintain height) help or harm handling?

Any suggestions for a reasonably priced wheel/tire combo?

Thanks.

[MJM]

I ran my Z06 at VIR (in the rain) and Summit Point (Jefferson Circuit). That and 13000 miles are about to make me get new tires.

They work great, I might look into Kumho's though. Primarily for the lower price although additional traction wouldn't hurt. Most everyone I have seen at track events either runs stock Z06 wheels and tires or 17's with Kumho's.

[Gordy M]

The Grand Sport wheels are ideal for the Z06. A friend of mine has them and an extra set of Z06 wheels. He runs the Kumho's on the 17's and Hoosiers on the Z06. Both hook up very well, but the Kumho's are considerably less expensive (cheaper!!!!).

[Lawdogg]

Hoosier makes a road race compound that will fit stock Z06 rims. If you are going to get a second set of Z06 rims, go with 18 inch rims all- around. That's what Doug Rippie recommends.

[Dave Schotz]

If you want to use 17's all the way around... the GS Rears with 17 X 9.5 Fronts will work well. And Kumho's definitely are the right financial choice, to just play with on the track.

Another hot setup would be say 17 X 10's in the Front with 275/40/17's (The new Kumho Ecsta Road Race Tire) And a set of 17 X 11.5 or 12's in the rear with the all new Kumho 335/35/17's!


If using the stock wheel sizes, I use the Circle Racing wheels... they are a few lbs lighter than stock... then I use Kumho's on the front and the Hoosier 305/30/18 on the rear (Since Kumho doesn't make that size yet!)

Enjoy!!

Dave

[Zippy]

Ron:

Will you be racing at the SCCA runoffs at Mid-Ohio?

Zippy

[racewheel]

gs wheel do not take full advantage of the clearences available on a c-5, there is an additional inch of room to the inside on the rear wheel wells. this allows a 12" wide rear wheel to use up to a 335 tire. custom made race wheels can be had for 17-1800 for the set in most any width or offsett in 17 or 18"

[IMA Z06]

RaceWheel,

Welcome aboard, Great folks and lotsa info here. Enjoy..............................

[Silver Bullet]

So you mix the hoosiers and the kumho's. How does that work??
I might go with Kumho's all a round for a full time tire. I only drive pretty much to track events in the car so with kumho's this used to be fine.
Don't know about Hoosiers with that.

[Dave Schotz]

Yup... I run Kumho front, Hoosier Rear. However that is because I race in Super Stock for SCCA Solo 2... and you must run stock wheel sizes. For SCCA T1... the racers can choose to run Grand Sport (17 X11) rears instead of the 18's... so Other tire companies can play! Hoosier unfortunately is the only one who makes an 18... at that time...

Kumho's is coming soon... but the 285 (the current new Kumho, isn't enough, they will be doing a 305 very shortly)

Kumho's are definitely a great tire driven on the street to the track! You won't have any issues!!

Peace,

Dave

[MJM]

Originally posted by Dave Schotz
Hoosier unfortunately is the only one who makes an 18... at that time...

Kumho's is coming soon... but the 285 (the current new Kumho, isn't enough, they will be doing a 305 very shortly)

Dave

Is Kumho releasing this new 305 in 17 or 18 inch?

If it is an 18 will it fit on the stock Z06 rears?

Also, which of their 17's is more suitable for the Z06 fronts, the
255/40ZR17 or the 275/40ZR17 ?

Thanks.

[Silver Bullet]

I hate buying new tires and also new rims that are heavier than my stock ones (GS compared to ZO6).
When is it expected about the kumho's with the correct 18 inch.
On a road course how have you seen (or autocross also) the combination of two dirfferent kinds of tires front to rear?

[Dave Schotz]

Reply to MJM

The New 305 will be in the 18" Size.

They currently have a 285/30/18, (The biggest 18 they offer)

The biggest 17 they have is a 335/35/17


The 275/40/17 is much more suitable for the Fronts on the Z-06.

Reply to Silver Bullet

I run the Kumho's up Front, and the Hoosiers in the rear. Primarily because Kumho does not have a proper Rear Size yet. The difference in Auto/x or Road Racing would be your first minute or so... the Hoosier does not come up to Temp as quickly as the Kumho.

As for an expected release date of the 305 (Meaning the proper size in my opinion) We would be lucky to see it by the middle of '02!


Also... as for Weight savings... Buy a set of Circle Racing wheels from www.ontrackproducts.com to save the weight, and the New Kumho's are within 1 lb of the Hoosiers!

Peace,

Dave

[Gordy M]

Goodyear has just come out with "R" compound tires in the Z06 sizes (265/295). According to one of there tire engineers, he used the Kumho as the base line and made the compound as close to it as they could.

He had them on at an aurocross in Akron and his times in his 2000 vert were about the same as mine were on Hoosiers.

[Silver Bullet]

Does tirerack carry the Goodyear R's??
Wonder how those handle??
Currently, in my experience, hoosiers are best for time. Kumho's a little slower but more predicatble and wear well and are cheap!! Very very cheap!!