Question: tires versus wheels

[Boss]

Just purchased 2 rear 245/40ZR18[run flat] tires for my 2000-C5..looking to upgrade my wheels to the Z06 style deep dish. They only come in 18/10.5,not in 18/9.5. I'm told "no problem" they will fit, but will stretch the sidewall a bit. I think the side wall will be weakened by this stretching. I'm certain someone has done this change, anyone have problems or is there something to be cautious about or "no problem" do it? I appreciate any input...Bruce

 

[Hib Halverson]

Not only will those smaller tires be hard to mount on 10.5-in. rears but they will look dumb.

I'd either buy the right tires that go on the back, or hold off on the wheels until you can afford the right tires.

 

[Boss]

Not only will those smaller tires be hard to mount on 10.5-in. rears but they will look dumb.

I'd either buy the right tires that go on the back, or hold off on the wheels until you can afford the right tires.

Thanks, but I did buy the right ones and the rim size for these 275/40/18's are from 9 to 11 inches.. to tell you the truth I thought I had bought 245's thanks for the response

 

[Toms007]

Yea, I figured that you mistyped the size. They will fit the 10.5" wheels, but will stretch them a bit. 295/35's would be a better choice.

 

[Boss]

rim size

Yea, I figured that you mistyped the size. They will fit the 10.5" wheels, but will stretch them a bit. 295/35's would be a better choice.

I checked the specs on the 275/45/18's the range of rim size they will fit is 9-11. so I don't think they will be stretched to a point they will be that noticeable. I checked on the 295/35's and they only have a 20,000 mile warranty do not come in run flats and a bit pricy, but thanks for the input..

 

[Toms007]

You are correct about the 295/35 being pricey and lack run flat capability. Lots of guys swear by, and at, runflats. There are arguments both ways. I'm a proponent of the runflats (or as Michelin calls them Zero pressure). In my neck of the woods. wait there are no "woods" and barely any trees :L , runflats are almost a neccesity, as there is so much distance between places.

And you are correct in saying that the specs show up to an 11" wheel for the 275/40 tire. A 275 width tire translates to a 10.8" tread width. On an 11" wheel the 275 will look different than it would on a 9.5", but would still be safe and acceptable.

 

[Boss]

You are correct about the 295/35 being pricey and lack run flat capability. Lots of guys swear by, and at, runflats. There are arguments both ways. I'm a proponent of the runflats (or as Michelin calls them Zero pressure). In my neck of the woods. wait there are no "woods" and barely any trees :L , runflats are almost a neccesity, as there is so much distance between places.

And you are correct in saying that the specs show up to an 11" wheel for the 275/40 tire. A 275 width tire translates to a 10.8" tread width. On an 11" wheel the 275 will look different than it would on a 9.5", but would still be safe and acceptable.

I'm no different here, but I don't have woods, but forests, as far as "zero pressure tires" if you drive in the Adirondack Mountains [over 6 million acres] which I'm at the base of, zero pressure is a necessity. Do you really believe 2 tenths of an inch will really look that different, I'm new at this, but what would be the difference that you'd really recognize?

 

[Toms007]

It's not the .2 (1/4" roughly) difference between the tire tread and wheel width so much as the difference between the stock wheel (8.5") and the Z06 wheel (10.5). That 2" difference will make the sidewalls stand out.