Corvette Z06 Forum banner

1 - 19 of 19 Posts

·
Registered
Joined
·
9,957 Posts
Discussion Starter · #1 ·
I was wondering why no one takes the rear Z06 rims and puts them on the front with different sized tires?

Would they rub?

Does it not handle well?

Just curious why that is not often spoke of as a performance or looks option to consider ..

Thanks in advance

JB
 

·
Registered
Joined
·
596 Posts
I run a 19x11 in the front with a 275/30/19 and a 19x13 in the rear with a 355/25/19 and IMO it's not the rubbing I'd be concerned with. I was told when I tubbed my car that you had to keep the front and rear tires within a certain percentage ratio of height and width which I think it was 7% not to affect the TC/AH while driving. I'm sure other members here can clarify the exact rationale for the above statement and correct me if I made an error on the numbers. All I can say is that my car handles extremely well and when I do something the car doesn't like it lets me know by kicking in the TC/AH :sneaky: Good Luck! :cheers:
 

·
Registered
Joined
·
5,491 Posts
They do.

If you look at my DE and track recommendations and all the Pro Solo and National Tour guys; we run 305/30x18 on 10.5x18 with +0.25" offset on the front. Basically we rotate the rear Super Stock tires to the front. This increases front grip and turn in, and decreases understeer and braking distance while raising corner entry, mid corner speed.

Note that the tire has a shorter and thus stiffer side wall and the tire OD is 25.5", same as the rear 315/35x17 we recommend. There are no fitment or clearance problems with this set up. Note that a stock 295/35x18 tire would have an OD of 26.6" and there is clearance problems.l

And of course the C5R's run 18" on all 4 corners.
 

·
Registered
Joined
·
999 Posts
I have 18x9.5 w/ 265/35s on front and 18x12 w/ 335/30s out back. I am also tubbed.



This set up works weel for me.

JWz06.
 

·
Registered
Joined
·
5,046 Posts
DJWorm said:
Note that the tire has a shorter and thus stiffer side wall and the tire OD is 25.5", same as the rear 315/35x17 we recommend. There are no fitment or clearance problems with this set up.
Doesn't this size have an issue with wearing through DRM ducts?
 

·
Registered
Joined
·
5,491 Posts
No its the 315/35x17 on 10x17, basically the T1 front set up that has a small clearance problem with the ducts. The undersized 10" rim makes the tire sidewall bulge more.

Brad and others have indicated that they just reinforced the rub area with some Kevlar. Also DRM has redesigned the ducts and the newer ones are thinner in this area to obviate the problem
 

·
Registered
Joined
·
2,616 Posts
10x18's Fikse's up front with 285x39x18 MPS.....no clearence or other issues. Rear (tubbed) is 12x18 with MPS 335x30x18.

Next set of tires will be MPS Cups: 295x30x18 and 345x30x18..... :thumb:
 

·
Registered
Joined
·
9,957 Posts
Discussion Starter · #9 ·
They do.

If you look at my DE and track recommendations and all the Pro Solo and National Tour guys; we run 305/30x18 on 10.5x18 with +0.25" offset on the front. Basically we rotate the rear Super Stock tires to the front. This increases front grip and turn in, and decreases understeer and braking distance while raising corner entry, mid corner speed.

Note that the tire has a shorter and thus stiffer side wall and the tire OD is 25.5", same as the rear 315/35x17 we recommend. There are no fitment or clearance problems with this set up. Note that a stock 295/35x18 tire would have an OD of 26.6" and there is clearance problems.l


-------------------

So 305/30 x 18's up front ....

I knew I saw a post somewhere on this...Thanks DJ.

Not sure I'd wanna run 17 out back though..

Thanks for the heads up....
 

·
Registered
Joined
·
9,957 Posts
Discussion Starter · #10 · (Edited)
265/35 YR18
97Y XL 220 AA A
1609 lbs.
50 psi
10/32"
25 lbs. 9-10.5"
9.5"
10.7"
NA
25.3"
822

-------------------

or ?


275/35 YR18
95Y SL 220 AA A
1521 lbs.
51 psi
10/32"
25 lbs. 9-11"
9.5"
10.9"
NA
25.6"
814

--------------------

for the rear wheels.

295/35 YR18
99Y SL 220 AA A
1709 lbs.
51 psi
9/32"
27 lbs. 10-11.5"
10.5"
11.9"
NA
26.1"
797
 

·
Registered
Joined
·
9,957 Posts
Discussion Starter · #11 ·
How about this as a front tire?

275/35 YR18
95Y SL 220 AA A
1521 lbs.
51 psi
10/32"
25 lbs. 9-11"
9.5"
10.9"
NA
25.6"
814
 

·
Registered
Joined
·
9,957 Posts
Discussion Starter · #12 ·
With this on the back?

295/35 YR18
99Y SL 220 AA A
1709 lbs.
51 psi
9/32"
27 lbs. 10-11.5"
10.5"
11.9"
NA
26.1"
797

Stock sizing...

Just thinking out loud that if the rear wheel of the Z06 fits on the front of the car...and we went with the new michelin PS2...

Might be a cool solution...
 

·
Registered
Joined
·
9,957 Posts
Discussion Starter · #13 · (Edited)
Is the stock C5 Z06 10.5 rear wheel going up front cause a problem fitting? even with these smaller tires chosen?

I'm just curious why no body has tried this setup.

Thanks..

JB
 

·
Registered
Joined
·
2,616 Posts
Not absolutely positive, but since we know you can get a 10.5" wide wheel to fit upfront, the stock rear C5 (and C6?) offset may not allow proper fitment.

DJ Worm said in his post you need a +.25" offset. He didn't say they use the stock rear rim up front, but they do use a rear 305 tire on a 10.5" wheel and it fits.

Here's an idea, jack up one side of your Z and switch wheels and see if the 295 on the front hits anything, and take a look at how much the tire sticks out from the wheel well.

HTH
 

·
Registered
Joined
·
11,339 Posts
I run 18's all around.

Dave Hill had given a lecture on the C5 when it first came out, and he said they found the performance to be better with 18's, but they opted for larger in the rear to appeal to the looks of the vette
 

·
Registered
Joined
·
3,212 Posts
I have 18s all around, with 285/30-18s up front and 315/30-18s in back. This keeps the front/rear diameter ratio change to less than 2%. There are no fitment issues at either end.

You are right to consider the front/rear diameter "stagger".

In a "normal" car where all wheels are the same diameter, it's easy for a handling computer to determine if a wheel is slipping relative to the others simply by comparing each axle shaft's RPM. All wheels turn at the same RPM for any given road speed because they're all the same diameter. If one or more wheels are slipping, those wheel's RPMs will be different by the amount of the "slip".

But the C5 OEM wheels are different diameters. The fronts are shorter than the rears, and so the fronts normally turn at a higher rate than the rears for any given road speed. The AH/TC computer has to adjust the measurments it gets from the wheel RPMs, for the different diameters, in order to compute each wheel's true speed.

If you change the ratio too much, you fool AH/TC and the effectiveness of these systems is degraded.

Example: going to a larger relative front tire diameter. For any given road speed, this set up looks to the computer as if the front tires are turning slower relative to the rears. Or viewed alternately, it makes the computer think the rear tires are going faster relative to the fronts. The AH/TC system determines if the rear wheels are spinning by comparing the computed front/rear rotational speeds (based on it's programmed-in assumption about how different the front/rear diameters are). A larger front tire will "fool" the handling computer into intervening at a lower relative front/rear wheel speed. TC and AH will cut in sooner, and AH may make "bad" decisions about how much intervention is required.

If you're turning AH/TC off for the Track, it doesn't matter what diameter tires you run so long as they fit.
 

·
Registered
Joined
·
5,442 Posts
Gary at Ronal Wheels recommended 19" wheels rear and 18" front rims. Looks great. He has beautiful rims.........now with smoke chrome powder coat paint. You think it is real chrome not "paint". He now has powder coated BRIGHT chrome paint. You have to wear sun glasses when you polish and wax these wheels. He is supporting vendor here.........look for 18-19" Wheel/Tire Pkgs. for Z06 on the left.
 

·
Registered
Joined
·
372 Posts
stock 18's fit no problem and look good IMO. Rocket Sled has a cool calculator on his site you can use to determine sizes.
 
1 - 19 of 19 Posts
Top