Largest width tire on stock 18 x 8.5 rims?

[Mabuhay]

Does anyone know what is the largest width tire that I can put on my STOCK 18 x 8.5 inch rims without rubbing against any suspension components?

The stock tire is 255/55-18. I am thinking of going 285/50 or maybe even 305/45. But I am worried about rubbing.

Anyone done this before? Thanks in advance...

[Quickid]

255 is the optimal width for an 8.5 rim. You can probably get away with 265 but definitely not 285.

[TriX5]

FWIW, I have Pirelli winter 210 size 285/40/17 mounted on 17x8.5 wheels.

[bren3085]

offset of the wheels will also depend on rubbage

[ard]

285/50-18 is perfectly fine on on an 18x8.5 rim. I DON'T KNOW ABOUT RUBBING.

(Nothing over a 285 will work on an 8.5" rim, from a quick survey on tirerack.)

The tire OD is also within a few tenths of stock diameter. 29.2 versus 29.3" on the 255/55-18

What tires are you looking at? Runflats or not?

[ba82]

Originally Posted by Mabuhay

Does anyone know what is the largest width tire that I can put on my STOCK 18 x 8.5 inch rims without rubbing against any suspension components?

The stock tire is 255/55-18. I am thinking of going 285/50 or maybe even 305/45. But I am worried about rubbing.

Anyone done this before? Thanks in advance...

I had some 285/60/18's on my 2001 for a few years with no problems. This would lead me to think the 285/50/18's would fit fine - HOWEVER, I just tried 265/65/18's and 265/60/18's as replacements. Both didn't fit for some reason according to the tire shop ....Hopefully someone can give you some advice to help you avoid this!