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      12-05-2010, 12:34 AM   #1
Seven7
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Winter tire sizes for the M3

Hey guys on the standard 18" the sizes are
Front: 245/40/18
Rear: 265/40/18

On tirerack they recommend
Front 235/40/18
Rear 255/40/18

which sizes do you guys recommend through your own experience? Many thanks !!
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      12-05-2010, 01:02 PM   #2
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Smaller width will provide a little better traction on snow
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      12-07-2010, 12:49 PM   #3
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I am running a 245 box setup, 245/40/18
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      12-07-2010, 03:06 PM   #4
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My experience is with 245/40-18 on four corners which worked very well. Size isn't as important as tire choice unless you are in Alaska or 6000+ feet in the Rockies.

I'm running staggered stock sizes this year with Michelin PA2s.
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      12-08-2010, 01:27 AM   #5
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the thing is, isnt running 245 really bad for your rear rims since the wheels on the back are wider? And also if you drive the winter tires on clear roads doesnt this affect the speedometer? lets say your're going 60 but it reads you're going 50km.
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      12-08-2010, 02:42 AM   #6
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Quote:
Originally Posted by k7-seven View Post
the thing is, isnt running 245 really bad for your rear rims since the wheels on the back are wider? And also if you drive the winter tires on clear roads doesnt this affect the speedometer? lets say your're going 60 but it reads you're going 50km.
other way around, but yeah

not a big deal
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      12-08-2010, 07:40 AM   #7
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Quote:
Originally Posted by k7-seven View Post
the thing is, isnt running 245 really bad for your rear rims since the wheels on the back are wider? And also if you drive the winter tires on clear roads doesnt this affect the speedometer? lets say your're going 60 but it reads you're going 50km.
lol not if youre running square wheels. I'm running 245/40s on a 18x8 6 series wheel, box setup, running 5mm more aggressive than my stock ZCPs.
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      12-08-2010, 08:33 AM   #8
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I'm running the stock staggered sizes on the OEM 18" wheels for my snows (pirelli sottozero's). I love the look and they perform well. They say that narrower is better but I was not willing to negatively impact the look of the car by going with narrower / lower profile tires (as tire rack recommends). I also like the additional protection that the higher profile and wider stock tire sizes provide (both from pot holes and curbs). That being said, I would probably try a snow tire that is less performance oriented than my pirelli's. There have been a couple of instances on steep/slippery inclines where I did not have enough traction. I'm not sure if a different tire would have been better or not....
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      12-08-2010, 11:33 AM   #9
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Both options are valid (stock or narrower). Deciding factors will be availability of the tires you want, wheel sizes, climate, driving habits, style preference and any other relevant circumstances.

The more snow you are getting, the more you should consider the narrower tires.
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      12-08-2010, 03:07 PM   #10
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Im currently running on stock 18'' rims, and i am worried if I use narrower tires, I can easily scratch or dmg the rims because the tires are not wide enough to cover the whole rim. Tirerack says 235/40/18 for my front and 255/40/18 for my rear...that shouldnt be a problem right?

they also recommended me a set of Michelin PA2 or Dunlop SP Winter sport 3D...do you guys know which one is better?
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      12-08-2010, 06:44 PM   #11
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just picked up a set of Dunlop 3d from tirerack yesturday, will have it put on this fri. come on SNOWWWWWWWWW
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      12-08-2010, 07:45 PM   #12
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http://www.m3post.com/forums/showthread.php?t=462328
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      12-08-2010, 10:41 PM   #13
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Michelin PA2? or Dunlop 3D?
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      12-08-2010, 11:10 PM   #14
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Quote:
Originally Posted by k7-seven View Post
Im currently running on stock 18'' rims, and i am worried if I use narrower tires, I can easily scratch or dmg the rims because the tires are not wide enough to cover the whole rim. Tirerack says 235/40/18 for my front and 255/40/18 for my rear...that shouldnt be a problem right?

they also recommended me a set of Michelin PA2 or Dunlop SP Winter sport 3D...do you guys know which one is better?
I have the exact same setup with the Dunlops. When I was detailing my car I noticed tons of little nicks and scratches on my wheel. My OEM 18"s are now on permanent winter duty now so need to shop for a new set by next spring.

There are a lot of potholes and uneven roads here so your wheels may fare better then mine.
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