[newoldbeemer]

I'm looking at square 245 as an option, but what are the options if I go staggered, to keep front and rear wheels+tires with (amlost) the same overall diameter?

The only combination I can find is:
225/45 in front
255/40 in rear

or,

225/40 in front
255/35 in rear

I just cant find the right size width for rear to match a 245 front.

Any help?

[metrickid]

245/35 -265/35 as the 1M coupe is a very meaty combination that gives the car a bulldog look.

Otherwise a 245/35 and 275/30 is pretty close to the stock 225/40 and 255/35 setup.

[newoldbeemer]

Doesn't 245/35 with 265/35 result in an unequal diameter between front and back?

Will 275 rear fit (on an 18" rim) in a lowered car with Mperformance shspension?

[metrickid]

Originally Posted by newoldbeemer

Doesn't 245/35 with 265/35 result in an unequal diameter between front and back?

Will 275 rear fit (on an 18" rim) in a lowered car with Mperformance shspension?

My dimensions were for a 19" wheel. For a 18" wheel you have to go up one size in height on all sizes. You can't fit a 275 on the stock 8.5" wheel though. And fitment also depends on offset and wheel width so without that info it is impossible to speculate about if it will be good or not.

So if you want to have the stock wheels it is 245's on all four corners I guess. I don't think a 245 on a 8 inch wheel will look good (if it is even within recommendations?!).

Regarding different sizes front and rear... BMW has 255/35R19 fronts and 275/35R19 rears on the F8x M and used the sizes I mention above on the 1M. So it is not the end of the world.

[.BMW.]

Recommended and allowed wheel widths for 18" 245 tires.

245/40-18, 8.5" recommended and 8-9.5" allowed, 1% shorter than OEM
245/45-18, 8" recommended and 7.5-9.5" allowed, 2% taller than OEM

In this thread you find some shots that show how Michelin PSS 245/40-18 fits on 8x18" wheels: f30post.com