Winter Wheels 640M square 8.5"? 225/45 tires?

Mako · 11-21-2015, 01:27 PM

so I am thinking of buying 4 BMW 640M winter wheels in the 8.5" size, one of the reasons being I have a set of winter tires from my 335i that are 225/45 and rated for 7"-8.5" wheels (Blizzak LMxx).

does anyone know why BMW recommends 9" in the rear, is it just cosmetics? its the front that would have a brake clearance issue, not the rear, the 8.5" have no issue there, and would only retract 4mm compared to the 9" they recommend (hardly noticeable).

I know BMW recommends 255/40 or 245/45 for winter wheels, but would there be any issue with 225/45 as long as they fit the wheel okay?

I find narrower tires in the winter are better which is why I would go 8.5" wheels and 245 (or 225 in my case) tires.

firedown31 · 11-24-2015, 01:41 PM

I believe Bmwguy11 has 225/45/18 winter tires on his car. 225 should work, you'll just have less dry traction than 245/255.

Bmwguy11 · 11-24-2015, 03:04 PM

Yea i use a square 225/45/18 all around with 18x8 rial P10 rims. Car drives fine for me.

11-21-2015, 01:27 PM	#1
Mako (Sold) '00 M Roadster '06 M Coupe '16 M3 '20 X3MC 1564 Rep 2,589 Posts Drives: '23 M3 comp Join Date: Jul 2009 Location: Chicago suburbs iTrader: (0)	Winter Wheels 640M square 8.5"? 225/45 tires? so I am thinking of buying 4 BMW 640M winter wheels in the 8.5" size, one of the reasons being I have a set of winter tires from my 335i that are 225/45 and rated for 7"-8.5" wheels (Blizzak LMxx). does anyone know why BMW recommends 9" in the rear, is it just cosmetics? its the front that would have a brake clearance issue, not the rear, the 8.5" have no issue there, and would only retract 4mm compared to the 9" they recommend (hardly noticeable). I know BMW recommends 255/40 or 245/45 for winter wheels, but would there be any issue with 225/45 as long as they fit the wheel okay? I find narrower tires in the winter are better which is why I would go 8.5" wheels and 245 (or 225 in my case) tires.
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11-24-2015, 01:41 PM	#2
firedown31 Major 913 Rep 1,427 Posts Drives: '16 AW M3 Join Date: Jun 2015 Location: NH iTrader: (0)	I believe Bmwguy11 has 225/45/18 winter tires on his car. 225 should work, you'll just have less dry traction than 245/255.
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11-24-2015, 03:04 PM	#3
Bmwguy11 Lieutenant Colonel 1252 Rep 1,760 Posts Drives: 2016 YMB M3 Join Date: Aug 2011 Location: Wisconsin iTrader: (1)	Yea i use a square 225/45/18 all around with 18x8 rial P10 rims. Car drives fine for me.
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