A 335/30-17 is almost exactly the same diameter as the stock 295. But it's 1.5" wider than stock. Depending on the offset of your rim, you might either rub the brake vent on the inside of the wheel, or poke out past the fender lip at the outside. I don't think it's possible to fit a 335 so it clears both ends.
A 315 is half again as wide, about 0.75", and it fits fine. I run 315/30-18s.
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When I changed out my wheels for last weekends event, I got the urge to mess with the brake cooling duct.
To get it off you have to remove the fender liner, but it's just 8 7mm screws (or 9) and everything just falls right off, so when I run the big meats I guess I'll just pull the duct.
Some air will still get to the rotor & if it's autox, the brakes don't get that hot anyway.
The 335's will stick out with stock offsets. You then run the risk of the fender lip contacting the tire in which case the fender lip will crack.
The solution is to raise the rear (which hurts handling) or to minitub and run a different offset/backset to avoid fender rub.
However you need to consider why your running 335's instead of the 315's. In AutoX the tire heats up from the outside in and from the shoulders into the center of the contact patch due to friction at the shoulders of the contact patch edge, whereas on high speed road course the tire heats up from the inside out due mainly to deformation.
If your not running +500HP, the 335 is TOO WIDE for AutoX as it does not have enough time to heat up the tire face. The 315/35x17 IS a better choice for an LS6 powered C5 (plus you don't have to mini tub or remove the brake ducts). The 335/30x18 is better on the LS7 powered C6 Z06 rear.
Additionally the 335 should be run on a 12" wide rim to be effective.
Furthermore the Hoosier A6 has a lower nominal operating temp than the Kuhmo 710. IMHO running a 335 Kuhmo 710 is a step backwards.
I'd stick with the 315's OR you could just buy an LS7 powered C6 Z06 to go with the 335's.
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I just picked up a 2002 Z06 and I'm trying to decide what tires to run for AutoX and Time Trials. I'm more concerned with AutoX, as I'll just be running my old tires for the road course events (as long as they last). I'm running in SS, so I won't have much in the way of modifications (stock wheels, Koni 3013 shocks, xpipe, catback, brake pads, and not much else aside from an alignment).
Anyhow, I'm planning on running Hoosier A6 with the 315/30/18 in the rear and I'm trying to decide on the 275/40/17 vs the 295/35/17 in the front.
From what I've seen, most SS autoxers run 295 front and 315 rear Kuhmo 710s. I don't know how effective a 295 is on a 9.5" wide wheel... but that's just what I have seen on probably a dozen Z06s. I can't speak much for the A6; I have only driven on 710s, and not even on my car. But the A6 is supposed to have a lower operating temp than the 710.
Hi Guys,
I just picked up a 2002 Z06 and I'm trying to decide what tires to run for AutoX and Time Trials. I'm more concerned with AutoX, as I'll just be running my old tires for the road course events (as long as they last). I'm running in SS, so I won't have much in the way of modifications (stock wheels, Koni 3013 shocks, xpipe, catback, brake pads, and not much else aside from an alignment).
Anyhow, I'm planning on running Hoosier A6 with the 315/30/18 in the rear and I'm trying to decide on the 275/40/17 vs the 295/35/17 in the front.
Any comments/comparisons on the two sizes?
Cheers,
Rod
Congratulations on the C5Z and welcome to
I run NCCC autox but I'm not familiar with classification rules for SCCA.
Can you run stock rear 18's in front?
If so, I'd go with 295 18's in front.
On stock front rims, I read that you can still run 295/35/17's ... the lower profile will help turn-in but the rim width will cause some "bow" in the sidewalls; on balance, should be better than 275/40/17. You'll need enough camber to use the whole thread.
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^VIR Turn 3 '08^-MungoZ06-'03 QS/ModRed - NCCC, NASA NCM Member - Z06 Fest IV,V,VI,VII
From what I've seen, most SS autoxers run 295 front and 315 rear Kuhmo 710s. I don't know how effective a 295 is on a 9.5" wide wheel... but that's just what I have seen on probably a dozen Z06s. I can't speak much for the A6; I have only driven on 710s, and not even on my car. But the A6 is supposed to have a lower operating temp than the 710.
Thanks for the info. Yeah, I'm wondering if I'll have a bit more control/feel with the better fitting tire (275).
Quote:
Originally Posted by DennyM
Congratulations on the C5Z and welcome to
Thanks, I'm loving it!
Quote:
Originally Posted by DennyM
I run NCCC autox but I'm not familiar with classification rules for SCCA.
Can you run stock rear 18's in front?
If so, I'd go with 295 18's in front.
On stock front rims, I read that you can still run 295/35/17's ... the lower profile will help turn-in but the rim width will cause some "bow" in the sidewalls; on balance, should be better than 275/40/17. You'll need enough camber to use the whole thread.
No, I need to run the 17's in the front. I've run too wide tires for rims in the past and I've always found them a bit squirmy. I'm wondering if it will be mostly a 'feel' thing, or if there is an actual benefit to running the 295's. Thanks for the comments guys.
You could put a 285/30-18 on the front instead of a 295/35-17, if you're willing to go buy yourself a set of 18" wheels for the front of the car. That's what I run... 315/30-18 rear and 285/30-18 front. Remember that if you intend to use the TC and AH functions, you need to stay within about 2.5% of the OEM front/rear tire diameter "stagger" (the fronts are smaller in diameter than the rears and the TC/AH computers are programmed to compensate for this different when calculating wheel speed. Change that stagger, you confuse the computers).
You could put a 285/30-18 on the front instead of a 295/35-17, if you're willing to go buy yourself a set of 18" wheels for the front of the car. That's what I run... 315/30-18 rear and 285/30-18 front. Remember that if you intend to use the TC and AH functions, you need to stay within about 2.5% of the OEM front/rear tire diameter "stagger" (the fronts are smaller in diameter than the rears and the TC/AH computers are programmed to compensate for this different when calculating wheel speed. Change that stagger, you confuse the computers).
I'm tempted to get that setup (i.e. 18" fronts) for time trials. For AutoX, I am forced to stay with the 17" stock sized rim in the front (or move up in class).
Have you tried a 17" in the front before?? If so, how much better is the 18" setup?
No, I haven't tried 17" up front. When I upgraded my rubber, I realized I needed 18" to get to a 285, to match the 315s in back and keep the overall F/R diameter ratio within the critical range. Originally, I just mounted a second set of rear wheels up front (10.5s) but the offest was wrong and while the tires cleared the front fender lip OK under suspension compression, the face of the wheel/tire poked out *just* a bit from the edge of the lip and it looked terrible (IMO). I bought a set of Motorsport Z06 repro wheels and went with 18x9.5 up front and that fixed the problem and I've stuck with it ever since...
No, I haven't tried 17" up front. When I upgraded my rubber, I realized I needed 18" to get to a 285, to match the 315s in back and keep the overall F/R diameter ratio within the critical range. Originally, I just mounted a second set of rear wheels up front (10.5s) but the offest was wrong and while the tires cleared the front fender lip OK under suspension compression, the face of the wheel/tire poked out *just* a bit from the edge of the lip and it looked terrible (IMO). I bought a set of Motorsport Z06 repro wheels and went with 18x9.5 up front and that fixed the problem and I've stuck with it ever since...
OK, thanks for the info.
I'm leaning towards the 275 at this point because it is shorter and lighter, and the 295 is only .5 inches wider on a wider wheel. On a 9.5" wheel, I'm guessing the difference is even less.
2004 Z lowered on stock bolts. I have some 1996 Grand Sport rims that I use on the Z for practice & track days 17x11 rears & 17x9.5 (I think) front.
I picked up some 335x35x17 (rear)710's and am wondering if they will clear everything in back. Big suckers.
I have run 315x35x17 (rear) with NO clearance issues.
What do you think?
Thanks.
BTW the tires worked & fit just fine. I ran a bit more pressure & shock stiffness so the back was not stuck down too tight. They do stick out a bunch, but tape job fixed that. No touching in or out. No tc ah issues on the street.
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