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Yep, I ran the numbers and figured it would work based on all the extra gap around the fenders but a a fella on the Facebook group stated anything over 27.5” is problematic. Any truth to that?
Trying to figure out the secrets of wheel/tire setup on this car and with lowering thrown in the mix. I see quite a few cars running 21’s in the rear and lowered. How does that fly if you can’t fit a 345/30 20” with no lowering?
The stock tires are 285/30-19 (25.73" tall) and 335/25-20 (26.59" tall) for a difference of .86" between the fronts to the rears with the rear being taller. It is known that as long as you stay under 1.25" difference in height with the rears being taller there wont be any issues. Anything more than that can cause issues with the TC, ABS abd Stabilitrak.
I went with a 19/19 setup and am running a 285/30-19 front and 325/30-19 rear currently. Once these tires are done I will go with the 295/30-19 (25.97") front and 345/30-19 (27.15") rears. This is a known good working upsize setup for the C7 GS/Z06 models.
The stock tires are 285/30-19 (25.73" tall) and 335/25-20 (26.59" tall) for a difference of .86" between the fronts to the rears with the rear being taller. It is known that as long as you stay under 1.25" difference in height with the rears being taller there wont be any issues. Anything more than that can cause issues with the TC, ABS abd Stabilitrak.
I went with a 19/19 setup and am running a 285/30-19 front and 325/30-19 rear currently. Once these tires are done I will go with the 295/30-19 (25.97") front and 345/30-19 (27.15") rears. This is a known good working upsize setup for the C7 GS/Z06 models.
Yeah, I am trying to decide between 19/19 or 19/20. Just so few tires options for a 20 rear as I do not want run flats or all seasons. From what I can tell there is only one option, the Continental ExtremeContact Sport 02.
Yep, I ran the numbers and figured it would work based on all the extra gap around the fenders but a a fella on the Facebook group stated anything over 27.5” is problematic. Any truth to that?
Trying to figure out the secrets of wheel/tire setup on this car and with lowering thrown in the mix. I see quite a few cars running 21’s in the rear and lowered. How does that fly if you can’t fit a 345/30 20” with no lowering?
Sorry, cannot provide any assistance, as still running the OE rims and OE tire sizes.
Hopefully someone in here has done it already, and could provide their expertise / experience.
Not sure if this affects you, but if you have CCBs, confirm a 19" gives you clearance.
Yep, I ran the numbers and figured it would work based on all the extra gap around the fenders but a a fella on the Facebook group stated anything over 27.5” is problematic. Any truth to that?
Trying to figure out the secrets of wheel/tire setup on this car and with lowering thrown in the mix. I see quite a few cars running 21’s in the rear and lowered. How does that fly if you can’t fit a 345/30 20” with no lowering?
There isn't a lot of clearance inside the rear wheel well especially if you are running one of the suggested rear caster settings for improved handling. Bumps may kill your wheel well liners if you go an inch larger in diameter. They aren't hard to replace but are more in the PIA range. Ordering from the dealer after negotiating a discount is cheaper than ordering them from an online parts place because of shipping cost. This is what my rear wheel liners looked like a few months ago:
There are some parts you don't want to damage located behind the wheel well liners. The transmission cooler is located directly behind the rear of the left rear liner and the parking brake mechanism is located directly behind the front of the left rear liner. The Evaporative Emissions Cannister is located behind the front of the right rear liner.
Sorry, cannot provide any assistance, as still running the OE rims and OE tire sizes.
Hopefully someone in here has done it already, and could provide their expertise / experience.
Not sure if this affects you, but if you have CCBs, confirm a 19" gives you clearance.
Good luck!!
CCB's will fit most name brand 19/19 setups that are designed for the GS/Z06 models. I have BC Forged 19/19 setup on my 19 C7Z and I was told they will fit the CCB models as well.
[QUOTE=Bill Dearborn;1606080411]There isn't a lot of clearance inside the rear wheel well especially if you are running one of the suggested rear caster settings for improved handling. Bumps may kill your wheel well liners if you go an inch larger in diameter. They aren't hard to replace but are more in the PIA range. Ordering from the dealer after negotiating a discount is cheaper than ordering them from an online parts place because of shipping cost. This is what my rear wheel liners looked like a few months ago:
There are some parts you don't want to damage located behind the wheel well liners. The transmission cooler is located directly behind the rear of the left rear liner and the parking brake mechanism is located directly behind the front of the left rear liner. The Evaporative Emissions Cannister is located behind the front of the right rear liner.
Bill, did you come to a solution?
I’ve got a 15 C7 Z and purchased 345/30r20 Pilot 4s
currently have the same rubbing problem. Curious if you were able to find a way to make it work?
There isn't a lot of clearance inside the rear wheel well especially if you are running one of the suggested rear caster settings for improved handling. Bumps may kill your wheel well liners if you go an inch larger in diameter. They aren't hard to replace but are more in the PIA range. Ordering from the dealer after negotiating a discount is cheaper than ordering them from an online parts place because of shipping cost. This is what my rear wheel liners looked like a few months ago:
There are some parts you don't want to damage located behind the wheel well liners. The transmission cooler is located directly behind the rear of the left rear liner and the parking brake mechanism is located directly behind the front of the left rear liner. The Evaporative Emissions Cannister is located behind the front of the right rear liner.
Bill, did you come to a solution?
I’ve got a 15 C7 Z and purchased 345/30r20 Pilot 4s
currently have the same rubbing problem. Curious if you were able to find a way to make it work?
That rubbing was caused by using slicks that are the stock diameter but mounted on 18-inch wheels. Running the uphill Esses at VIR at triple-digit speeds causes a lot of front/rear suspension compression and even stock-diameter tires carrying pick-up rubber from the track will hit the liners. If you baby the car over bumps you might not hit the liners but there is no fun in driving it that way.
12-27-2022, 03:41 PM
