Mobil 1

My 16 Stingray 1LT has 285/35/ZR19 PSS on the rear and even though there is decent thread left (24k miles) they have become hard like plastic. Even slight acceleration and it wants to fish tail. I'm about to buy a set of new rears but was wondering if there is a size that is wider that will still fit on the stock rims.
Thanks

Jmhornz71

Sometimes tire rack or discount tire will list a largr tire that will fit

themonk

I have 295 Cup 2's on my Z51 (20") but I heard (and don't quote me on this) 305 is the max on Z51 rims.

Avanti

Imho, and nothing more, you'll be certain with stock-sized.

I'm sure there are probably fatter that will physically "fit" on the wheels, but who knows how the profiles will actually be when installed. For example, with correct air-pressure, will they still be flat across the tread or look like the surface of a basketball? Well... okay, a little exaggeration. All the best, in any event.

fsvoboda

Good question. The problem is that when you start making changes you essentially become your own development engineer. You could probably sneak a wider tire onto the same rim, but what are you going to get from this? You would have to have a similarly wider tire on the front to maintain equivalent handling and sooner or later you probably would have invented . . . the Grand Sport!

I used to do stuff like this and enjoy the complications, but finally got older and had other things to do. Good luck!

Guard Dad

Corvettes are not some generic family sedan with tires selected with a priority on wear, ride and price. If you fit a taller tire than stock without a proportionate increase in front tire height you can mess up the computer. You will also change the handling, most likely for the worse. The rim width and tire profile/size are so closely matched on your car (a tire not properly matched to the rim doesn’t flex as it was designed to which negatively affects traction, wear and response) that to make the most of a wider tire you probably would need a wider rim. It’s not that you can’t improve a Corvette it’s just that a car like yours is pretty dialed in just the way it comes from the factory, you start making indiscriminate changes you’re probably not going to be thrilled with the results.

REPOED C7

I have Michelin Pilot Sport 4 S tires on my 2016 with Z51 wheels:

295/30/20 & 255/35/19 - No rubbing and car is lowered all the way on stock bolts.

JMII

This thread has some info: https://www.corvetteforum.com/forums...-a-z51-c7.html

As mentioned above you need to maintain the correct ratio both in height and width as the C7 (like most sports cars) uses a staggered setup. So if you go wider you have to go with a shorter sidewall to ensure the overall diameter is maintained. This applies if you are only changing one end of the vehicle, which is not recommended due to handling reasons. Because if you increase rear grip the car will understeer as the front will give up traction sooner as it is too narrow in relationship to the rear. This is also why you shouldn't mix compounds of tires front to rear (unless drag racing) and really should replace fronts and rears at the same time. Basically if you go wider out back you should go wider up front to keep the overall grip level equal to the factory setup.

Now being forced to replace the fronts does give you the advantage of being able use their sidewall size to maintain the correct height ratio even if the rear sidewalls are different. There are tire calculators online that you can plug various sizes into in order to figure which combinations will work, like this: https://tiresize.com/comparison/ You also have the physical limits of the wheel (rim) width to worry about so check this chart: https://i.stack.imgur.com/jHVET.png

I haven't done all the calculations for the C7 but as example on my Nissan 350Z I went from:
Front 225/45-18 to 245/40-18
Rear 245/45-18 to 265/40-18
on the same size wheels with no problems because I maintained the proper stagger and the tires still fit the factory wheels without being stretched or ballooning out.

FKING1

305 rear & 265 front on stock Z51 rims.
Had a rub on rear drivers side only that I cleared by grinding clearance in plastic liner.
Over 3000 miles with no probs.

Patches

This is what I run on my stock Z51 wheels.

I run 20" 285's on front and 21" 375's on my HRE's on my Z51. And yes, they fit and drive awesome. No issues with suspension.

FLEXjs

If you want to keep the same tire height as stock you'd need a 335/30/19 tire but you'd need a wider wheel, at least 11" wide.

If you go any wider than 285 with the same aspect ratio you're going to get a taller sidewall. If you drop the aspect ratio from 35 to 30 you will get a shorter sidewall until you get to 335/30 and that is exactly the same as your stock 285/35 but that tire is too wide for the stock 10" wheel.