NoOne

Winter is here(well almost it was 60 today) but the snow is coming and I was planning for the winter.


Did the SC and some other things last winter and I had pretty much settled on a Z06 body conversion for the bigger wheel/tire package.


My only reason for doing this is to get more traction, it not for cosmetics.


I had seen another poster, now that I cannot find, who put some pretty big rims on the back, that fit perfect, and did not stick out. They were custom rims and I'm not sure not cheap.


Looking at the cost of a Z06 w/ wheels compared to just wheels and being able to come close in tire size I want to compare.


First criteria is it has to be a decent road tire, no drag radials, no all seasons, inferior performance tire to the current ZP's. I want the car to handle as well, if not better. I'd like Cup tires but they do not seem to make them in a size that fits.


888's are fine. Tire wear is not a concern. The other plus is I can keep my stock rims and use them if we travel.


With a cost no object wheel what can I do in a good tire? I'm at 640rwhp and won't go beyond that. At 570 it was just about right, the meth pushes the stock tires a bit too much.


Second criteria it is has to look right. This is solely my opinion but a lot of members give others complements on tires and wheels that just do not look right. Fit in the wheel well, if its going to rub it hits the liner not the fender lip.


Car is lowered and I can deal with a bit of rubbing on extreme motion of the car so long its against the liner, not the body.


Thanks!

C7&7

Are you asking what the largest you can get without the Z fenders?

I run a 20/21 setup and a 375 in the rear. Still doesn't hook from a dig though with 660 to the tire. I don't really want it to. From a 60 roll it hooks.

NoOne

Biggest width in a decent tire, yes.


21's have a lot less side wall and I'm wondering how that lack of sidewall effects traction.


What tire are you running?

robert miller

21 in the rear no way it will hook at all with no more side wall than that. On 600 to the rwhp he is lucky that it hooks at 60 mph.

C7&7

I run Pirelli Pzero's 285/25/20 and 375/20/21

If you're looking to dig race the car of course a 21 is not the right thing. However I wanted a bad *** set of HREs and wanted a lot of meat in the rear. I don't want it to be some hole shot car, but if I get into a roll race or two I want it to hook, and it does. The Pzero's are great tires.

Z06 1of38

Maybe this is a dumb question, but you have a c7, or a c7Z?


If a C7 (not z06) I'd love to know your tire, wheel and offset details if you'd share them.

Thx

C7&7

Nope. Not a Z. 2014 z51

20x9.5 and 21x12 HRE P40SC in Brushed Dark Clear with Pirelli Pzero's 285/25/20 and 375/20/21

Size Front 20x9.5 ET57 with 285/25/20 Tires
Size Rears 21x12 ET92 with 375/20/21 Tires

NoOne

I want to stick with a 20".


What I want is traction, more than there is now. I never expect to get traction out of the hole without DR's or slicks.


Before the car was pretty driveable at WOT in 1st gear before I put the meth on, now its mid 2nd gear if the weather is less than perfect.


I'd like to get it back to where it was at that power level traction wise.

blue_bomber697

The largest you can go on a 20" wheel is 325 width on a 12" wheel. I think it's in Pilot Super sports and probably some other tires.

However there are very mixed reviews on this size. For some people it rubs, for some it fits perfectly. Ben at Weapon X says he can make it happen. Your offsets become extremely important at that size.

If you want to be safe, 315's on 11" wheels fit no problem. Offsets are still important though. I personally am going with 20x11 wheels with 315 R888 rears. I'm hoping that will hold power decently. I'd love 325's in the rear, but I can't justify spending that much money and risking it not working properly and rubbing.

B Stead

Here's one C7 setup:

Front, 295/30-19 Pilot Sport Cup 2 tire, 19 x 10.5 59mm Oz Superleggera III wheel
Rear, 315/30-19 Pilot Sport Cup 2 tire, 19 x 11 75mm Oz Superleggera III wheel

A wide body kit is not needed for this.


Here's the C7 stick-out setup:

Front, 315/30-18 Rival S tire, 18 x 11 44mm Forgestar F14 wheel
Rear, 335/30-18 Rival S tire, 18 x 12 62mm Forgestar F14 wheel

This setup sticks way out and the car can't be lowered. Spring rates must be Z51 as a minimum and really should be 650/800. Or the car might need to be raised 1/2"
.

Higgs Boson

315 on a 75mm offset is going to stick out for sure. I had a 325 on a 83mm that stuck out.

I run a 305 on an 83mm that doesn't stick out and is what I consider flush with the fender.

Wider than a 305 you need to start really increasing the offset to push the wheel in but there is already no lip as it is. The C7 really doesn't take wide wheels well in a functional and visual way.

A 375 on a +92 must be really close on the inside, might stick out more than some are comfortable with (visually but maybe not functionally) and probably hit the control arms when you jack up the car and they droop.

blue_bomber697

What do you think the offset should be for a 315 tire on an 11" wheel? To not stick out.

CW4L

20/21 with 375 rears on a 20x12.5 rear no traction with that Pirelli at 600++ HP otherwise great tires. 20/20 we have several options to get you some great tires, 19/19 will provide the best traction and lots of options as well.

If going to a 20/21 and want some traction best to stay with michelins and do a 21x10 with a 295 Michelin PSS or a 21x12 and a 325 Michelin.

At least thats my two cents we have 375s on and they dont hold a lick. Love the Nitto NT05s for traction, but whatever you want or need we can do it and have been for years

As far as offsets whatever you decide to run from 18/18 to 21/22 we have the proper offset for every vette in existence and even the ones modified. Its not difficult to get correct offsets just have to know what the customer wants and what tire size and purpose etc etc. But again 20/21 we love the looks with a 355 or 375 but traction, umm not gonna happen at high HP Applications.




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Higgs Boson

88mm

NoOne

Then let me narrow this down by tire choice:


Toyo 888
Nitto NT01
Bigger ZP's(from what I read the ZP is better than the non-ZP tire)
Cup Tires


I think that is pretty much the best tire set out there. The ZP seems to be the best all around tire without going to a competition tire or Cup tire.


Out of that list what is the biggest I can go in a 20? I have no interest in 21's out back.


I also do not want to go down to 19's.

Higgs Boson

305 or 315 with the right offset. keep the diameter under 27"

B Stead

ZP's are run flats and don't compare to the other choices. It's Super Sports that were probably meant and they are not quite track tires either.

A 325/25-20 Super Sport is getting some mention because the tire diameter is reasonable and because a 20" wheel will fit easily around the suspension arms. I would attempt it on a 20 x 12 85mm rear wheel.

But the subject said wide body kit. With a wide body kit run either the C6 Z06 wheels and tires or the C7 Z06 wheels and tires. The scrub radius will be in orbit but that's the only way to fill up the wide body kit
.

Higgs Boson

I would not go 325 on an 85 as they stick out on an 83. 325 no less than 90-92mm

NoOne

No I meant ZP's. The Zero Pressure Super Sport has been tested to have better traction than the non-ZP, at least on the compound uses on the C7.


The Cup tire is the near track tire.

B Stead

ZP Super Sports are not as good as non-ZP Super Sports. The pressure recommendation for track use is one hint and another is the weight of the tires.

But the C7 Z06 optional Pilot Sport Cup 2 is a ZP. However, it appears to be a lightweight ZP
.