c54u

Searching for this information on the base model, I was not able to come up with any.

Anybody?

JerriVette

Not ywt but larger diameter than present base model probable

keeks2915

Yes sir..... Posted about 8 weeks ago. Search my user name and you'll find it. Exact tire sizes.

keeks2915

Here you go. http://forums.corvetteforum.com/c7-g...more-info.html

I think I have them reversed. Front and back should be changed to be accurate.

c54u

Thanks

CaryKen

Just looked up 235-25-20 on TireRack.com. There isn't a single tire available in that size. Would they really create a brand new size combination that offers no existing choices?

However there IS a P335/25ZR20 made by Michelin. This seems more probable and means Keeks' original size postings of front/rear make more sense if it was just a typo on the first digit. Then we don't have to swap the front/rear sizes from what he says he saw.

In other words, if Keeks is right, we are looking at Michelin Run Flat Pilot Sports with P285/30ZR19 frt, P335/25ZR20 rear.

I say Michelin because that's what is already available in Run Flat at the given size.

keeks2915

Make sense to me ...

Ryephile

Those are the exact sizes for the C6 ZR1, for what it's worth. 10mm wider front and back vs. the C6 Z06 & GS, and 40mm front / 50mm rear wider than the C6 coupe. That's a big jump in size for the base model. I wonder if the sizes Keeks came across are for the C7 Z06 and/or ZR1?

keeks2915

I had to info coming fast and furious and I am not really up on tire size stuff, but it was being related to C7 under the comment that the tires were not as big as the C6.

So, I have likely mangled the message somehow.

c54u

From original post from keeks2915
how about tires...P285/30ZR19 frt, P235/25ZR20 rear

They may be:

235/30/19 for the front
http://www.michelin.ca/tire-selector...35/30/19/tires

285/25/20 for the rear
http://www.michelin.ca/tire-selector...85/25/20/tires

JerriVette

235/30/19 and 285/25/20 would be great for the base c7..

More is not always better and the slightly larger diameter keeps it contemporary.

The fact that the car should drop about 7 to 10 percent in weight is even more to the reasoning

obzidian

If so, that would put the front tire around 24.6" overall. A 285/20/20 (TINY TIRE BTW.. Less than an inch of sidewall) would also put it in the 24" overall range as well.

The C6, if I remember correctly, are in the 26" in range, including those ZR1 sizes.

I can understand a 235mm front to improve steering sensitivity (faster turning tire) but I just don't see it with a 24" overall since it would be change from what we are already used to. But given how new and improved this new car will be, a smaller tire is also a lighter tire. So we'll just have to wait and see.

It may sound a bit far fetched but we could very well get these:

F: P285/30ZR19
R: P335/25ZR20

I personally don't like running a 20" tire in the rear but so be it.

rcallen484

^^^ makes the most sense.

c54u

18 inch first and 19 in second in comparison

C6 Stock Tire - 245/40R18
C7 potential tire 235/30R19

Section Width: 9.64 in 245 mm`
Section Width: 9.25 in 235 mm

Rim Diameter: 18 in 457.2 mm
Rim Diameter: 19 in 482.6 mm

Overall Diameter: 25.71 in 653.03 mm
Overall Diameter: 24.55 in 623.57 mm

Sidewall Height: 3.85 in 97.79 mm
Sidewall Height: 2.77 in 70.358 mm

Radius: 12.85 in 326.39 mm
Radius: 12.27 in 311.65 mm

Circumference: 80.77 in 2051.5 mm
Circumference: 77.12 in 1958.8 mm

Revs per Mile: 809.0
Revs per Mile: 847.2

Actual Speed: 60 mph 100 km/h
Speedometer1: 62.8 mph 104. km/h
Speedometer Difference: - Speedo Difference: 4.721% too fast
Diameter Difference: - Diameter Difference: 4.52%

19 inch first and 20 in second in comparison

C6 Stock Tire – 285/35R19
C7 potential tire 285/25R20

Section Width: 11.22 in 285 mm
Section Width: 11.22 in 285 mm

Rim Diameter: 19 in 482.6 mm
Rim Diameter: 20 in 508 mm

Overall Diameter: 26.85 in 681.99 mm
Overall Diameter: 25.61 in 650.49 mm

Sidewall Height: 3.92 in 99.568 mm
Sidewall Height: 2.80 in 71.12 mm

Radius: 13.42 in 340.86 mm
Radius: 12.80 in 325.12 mm

Circumference: 84.35 in 2142.4 mm
Circumference: 80.45 in 2043.4 mm

Revs per Mile: 774.6
Revs per Mile: 812.1

Actual Speed: 60 mph 100 km/h
Speedometer1: 62.9 mph 104. km/h
Speedometer Difference: -Speedo Difference: 4.841% too fast
Diameter Difference: - Diameter Difference: 4.62%

JoesC5

C6 fronts are ~25.6"
C6 rears are ~26.7"

To maintian those diameters it would require the C7 base to have

Fronts of 235/35ZR19(25.5")
rears of 285/30ZR20 (26.7")

For an hi-po model it would then require

Fronts of 285/30ZR19(25.7")
rears of 335/25ZR20(26.6")

ZL-1

These sizes make sense for the introductory base C7. (Correction: they're for the high performance option, which still needs good aero and mpg numbers) They'll help to achieve the good aero numbers and outstanding mpg that are two of GM's goals for the C7. Expect Corvette-specific tires, likely with LRR (low rolling resistance) in mind and no heavier than necessary. LRR technology is becoming increasingly important to automakers. Michelin already has some experience with LRR high performance tires. Expect both wheels we've seen to be as light as possible too.




.

Jaboor

I hope they are P Zero's!

Raitzi

I hope front tires are not much wider than 240. Wide tires can feel **** to drive and can make steering feel numb.

glhs386

Super Sports > PZeros. And a 235/285 setup sounds like a formula for increased understeer, I'd bet on something like 255/285 instead. I could be wrong, though.

toxin440

Unless GM is just going ***** to the wall crazy on the wheel tire combo -- I don't see how the base car would be rolling with a 20" rear tire that's Z06 size.

Keep in mind this is the base car they have to save room for some upgrades down the line. Not only that but let's keep in mind this car was designed to sell for what? 55k? Requiring a base car to have tires that are Viper ACR quality and size just make no sense to me.

I like a big sexy deep dish wheel on high end models (z06/zr1) but having clown shoe sized wheels on a base model from the factory just sounds a bit off to me.