JohnAlley

Looking for some advice from the experts. Needing to replace my A6's, when I got the car it had 315's on all four corners. I wore them out and put on some 295's and I could not tell a big differance. I am still fairly new at this so am looking for some one who has been doing this for awhile. Are the 315's really that much better than the 295's ??

PushinTheLimit

John, I've run 295's on the front of my car a few times for some races this past year. One in particular was at Road Atlanta. I didn't notice a huge difference in how the car felt, might've been a slight more push on corner exit... but I've ran my best time there on a 315 square setup.

Something that I've wondered is that I have to run at least an 1/8" spacer on my front CCW Classics, when I run my 315 tires up front... they stick out quite a bit. When the car gets aero next year, I wonder if 295's would be better in that case since they would tuck in more and not be casuing as much aero drag like the 315's do?

JohnAlley

Will be adding the aero sometime mid-May so I might stick witrh 315's until then a see what happens with 295's and the aero pkg.

Short-Throw

I've run both sizes on my T1 car. I really believe it's more of a personal choice and not a pure mathematical answer just because of the bigger footprint on the 315s. I found with the 315s I had to correct oversteer more often (and quicker) than with the 295s. Some drivers like a looser rear end (ok, there's a lay up for an off topic joke) and some don't.

If you're not pushing the car very hard, it doesn't matter, but when you step up your ability the front end will grab a but more with the 315s so have your hands ready.

With you being fairly new, I'd try 295s and see if you feel you're driving the car to it's limit.

Mike

Painrace

One set up I run is Forgeline 18" X 11.5" with 7.75" back spacing on the front and Forgeline 18" X 12" with 8.3125" back spacing on the rears. The tires I use are all Goodyears, #4355 (As) on the front, 25.7" Dia; 12.4" section width; 11.8" tread width; weighing 26.8# and #4356 (As) on the rear, 26.2" Dia; 13.1" section width; 12.6" tread width; weighing 29.2#. The fronts are very close to everything but no issue in hitting on the track but they will hit if you turn too tight in the pits or loading. This setup is faster than the stock wheels with Hooser As on it. However, I run both depending on the track and conditions. Goodyear also makes Rs (#4310 fronts and #4311 rears - same size as As).

If you car is slightly pushing change front air pressure slightly. It is probably faster at RA to run a little higher tire pressure on the driver side. During my racing days we ran four different tire pressures at the start at RA!

I have always found Corvettes to handle better with a slightly smaller diameter and tread width in the front. Just my 2 cents from a old worn out slow shoe.

Jim

drivinhard

IMO 315 is way too wide for the 10" T1 front wheels. 275-295 is a better fit.

Jason

That's crazy talk. Everybody knows you need to run 315-345 in order to be fast.

Z06ness03

I'd have to agree with Drivinhard.. 315 is a tad too wide for a 10" wheel. 295 is ideal so you don't pinch the sidewalls and create less tread contact due to tread bulge.

PushinTheLimit

Considering the price jump that Hoosier has made on their tires... I'm pretty convinced on giving the 295's a try on the fronts and keep 315's for the rear. That will also keep me from getting my rims mixed up and putting a front wheel in the rear

2 GTOs

I usually hear "bigger would be better", but I'm not sure if that applies here as well.

subscribing

yooper

Thanks for sharing.

Is RA Road Atlanta or Road America? Assuming your spec is for the C6Z,
does it apply directly to the C5Z?

Again, thanks for sharing.
Bill

CP Thunder

We switched to 295/315 setup last year........no real handling difference noted.......somewhat better better temps across the surface......

SouthernSon

John, I just got through mounting the 318/18's on the front of mine today. I had to use an 1/8" spacer to clear the Wilwood SL6's. Man, do they stick out. The car is lowered with 1050# spring in front. I believe I may have a problem running with you next week. I do have the worn out 17" for the front if too much rub. I might just bring my dremel tool instead.

SouthernSon

Running 18" on all four?

Painrace

Road Atlanta and C6Z. Staggering air pressure in all four tires is the norm in racing.

Jim

CP Thunder

We still run the 17s............

rustyguns

damn right!

rustyguns

were you running sicks or DOT's? what sizes and what pressures did you use? what was air temp that day ? how did you place?