Translator

For a supercharged C7 with around 587 RWHP SAE? Which combo on STOCK Z51 wheels, and why? Will either combination fit properly? I know that the Toyo's run narrower than the actual advertised 315 diameter. if going with the 285 for the rear, Toyo only makes a matching 19 up front wit the same 35 height (versus 30 for the rear and 35 for the front).

Car is NOT lowered, just a little added weight up front from a centrifugal supercharger, but that is it. Would any of the two combinations rub, or set a check engine light, or present issues with the ABS/traction control?

I do NOT track or autocross, nor do I do any dig runs (no burnout's either). I am just looking for a set of tires that will hook in 1st and 2nd gears from a roll, especially when the weather is colder outside (I understand no tire will hook in 30 - 40 degree weather).

PS: The car is NOT a daily driver either. Only driven around 3.000 miles per year.

Thank you in advance.

NTMD8R

I put R888 265/35/19 on front and 285/35/20 on rear on my stock Z51 wheels.
I do have the car lowered on stock bolts.
I did have -1.8 front camber and -1.3 rear camber.

All was fine.... we did rub a bit on the fender lips,
but nothing I am concerned about, and no check engine light.
The rub actually removed a small amount of rubber along the outer edge
(nothing to really notice at all), and that was that.

We do autocross.
I have since gone with wider wheels (19/10, 20/11), and larger
R888 tires (295/30/19, 315/30/20).
I also added LG Motorsports G7 sway bars.
I had to remove the washers from the upper control arms, to get more camber
(-2.2 front, -1.8 rear), and no rubbing and no check engine light.

Translator

^^^Thank you for your input sir. Any idea if the 315/30ZR20 and 265/35ZR19 combo would work on a NON-lowered car with the stock wheels and no ill issues or side effects?

Translator

PS: If I go with the 285 rear's, I think that I will go with the 245 up front, versus the 265.

Higgs Boson

stock wheels, you can go to 255/295 or stay stock width, IMO.

Translator

Hi Higgs, Toyo does not manufacture those sizes that you mentioned. Otherwise, those are the sizes that I would want. I checked Nitto's and they to do not manufacture that combination either. What gives? I believe that Michelin PSS's NON-run-flat may be manufactured in those sizes? However, how much benefit would they provide traction wise over the OEM Michelin's? Probably not much? This is the reason why I have narrowed it down to the Toyo R888's, and it appears like the two size combinations that I mentioned are the most popular. I would love to go with the 315/265 combo, but afraid of issues. I believe that Theta runs this combo, but not 100% certain. I would like to hear from others as well.

thegame

Higgs is that just because of the brand of tire runs thinner? Would the Michelin super sports non run flats 255/295 fit stock z51 wheels?

Higgs Boson

the michelins will fit, that's what I run, michelin super sports non run flats. that's what I recommend for the street. track or drag is a different story of course. the super sports work great unless you are just hammering 1st gear on the street but when they are warmed up they will hold that 587 rwhp really well. plus the toyos are loud as hell and will wear out way faster and, imo, don't have "that" much more traction than the super sports.

Translator

Thanks again Higgs for the informative reply. From previous postings, I noticed that you are not a huge fan of the Toyo R888 I had them in a supercharged LS3 Vette back in 08, and quite honestly, they performed well. I sold that Vette, and two owners later and after 20.000 miles, they were still not bald, LOL. However, mileage is not a concern for me, as I only drive my C7 around 3 - 4.000 miles per year.

Let me ask you this, would the Michelin Pilot PSS's in the 295/255 combo that you suggested perform SIGNIFICANTLY better and offer SUBSTANTIALLY more traction than the factory OEM Michelin run flats that come with the Z51 package?

Higgs Boson

probably not. if you want to floor it around corners then you need something else....depends on how crazy you like to get on the street. I keep a different set of wheels and tires for track use.

blue_bomber697

So 265 front/305 rear MPSS will not fit on the stock Z51 wheels hey? We have to buy aftermarket rims in order to fit larger than 255/295?

Higgs Boson

No, I think they will fit but fitting and fitting as good as possible are two different things.... If you just want to keep your wheel off the ground then there are probably a lot of sizes you can do that with.

MikeLsx

I wouldn't run any size other than 285 on 10". really wish the Z51 was 10.5

Vegas07C6

I am running 305/30/20 in the rear and 255/35/19 in the front. I have a base with HRE wheel setup. 315 will fit....many guys on here running that set up. Toyo makes the 315/30/20 in the R888. I plan on going to those soon.....I need more traction.

Translator

Thanks. Are your HRE wheels the same size as the stock Z51 wheels? I imagine larger? I am considering the Toyo R888 in the 315 size. When you mention it fits, are you referring to the stock wheels?

Translator

Thanks for all of the input guys. Again, no track or autocross use, nor any dig runs. My main goal is to obtain FULL traction at my power level in a straight line roll on acceleration; hopefully from a 20 - 30 MPH roll in 1st gear. if not, at LEAST full traction from 2nd gear from say 40 MPH or so. In warm 80-plus degree weather, several tires will do the trick; however, when temps. drop to the 40-50 degree range, that is when traction becomes an issue.

I would love to hear more input from those that have specifically tried one of the two Toyo R888 combos that I have inquired about.

NTMD8R

The R888 tires (been using them for 6 years) are very good in the warm and dry.
They are also quite good in the cool and damp.
If it is raining, then drive cautiously and don't do anything abrupt or stupid... but they will hold on pretty good.

Translator

^^^ Do you know of anyone that runs the 315/30ZR20 and 265/35ZR19 combo with no issues on a NON-lowered car w/stock Z51 wheels?

DoubleDown

I was also wondering if the 315/30 ZR20 will fit on the Z51 10" wheels. I found this thread discussing it; check post #4.

https://www.corvetteforum.com/forums...ire-sizes.html

NTMD8R

I would be reluctant to put 315 wheels on a 10" wheel.
315 tires are 12.5" wide (section width), so you are talking about 2.5".
A good rule of thumb is to go no more than 1.5" wider in section width than wheel width. I stopped at 265 width for my stock Z51 (actually my 265s are 10.4"... so I fudged quite a bit.... 1.9"). They do bulge out over the rims a bit.
As long as you have a good stiff sidewall, things are probably going to be OK.
But if you have a soft sidewall tires, then you are likely to get rollover when cornering
aggressively. (this is where the tire actually rolls off the rim).

Good Luck