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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F34 3-Series GT (Gran Turismo) Forum > Square setup w/ 18x8.5 400M wheels?
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      08-29-2019, 11:37 AM   #1
flyboy1717
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Square setup w/ 18x8.5 400M wheels?

Curious if anyone is running a square setup with 8.5in wheels all the way around and 255/40R18?
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      08-29-2019, 12:54 PM   #2
Billfitz
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Assuming this is for an F34 and not a 2003 M5 they're about 3/4 inch too small in diameter. If you go with a 255 width it should be a 255/45. That's a tad larger than stock, which is better than smaller.
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      08-29-2019, 01:45 PM   #3
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not sure if F34 oem offsets are similar to the rest of the F3/4-series but 18x8.5 400M rears have a +47 offset. i suspect +47 is too high for the front and may rub part of the suspension or inside of the fenderwell. it will also have a more tucked appearance even if it did fit.
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      08-29-2019, 03:38 PM   #4
flyboy1717
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Quote:
Originally Posted by Billfitz View Post
Assuming this is for an F34 and not a 2003 M5 they're about 3/4 inch too small in diameter. If you go with a 255 width it should be a 255/45. That's a tad larger than stock, which is better than smaller.
Thanks for the quick replies. This is indeed for a 2014 F34. I just picked up the car on Tuesday. I've got a set of left over Yokohama snow tires from an E60 that I was thinking about mounting on the 8" wheels, and using the 8.5"'s for a non winter square setup. This would assume that I buy another staggered set of 400M wheels (8 and 8.5s), although it seems that the 8.5s may not work on the front axle due to the offset.
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      08-30-2019, 10:30 AM   #5
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Quote:
Originally Posted by flyboy1717 View Post
Thanks for the quick replies. This is indeed for a 2014 F34. I just picked up the car on Tuesday. I've got a set of left over Yokohama snow tires from an E60 that I was thinking about mounting on the 8" wheels, and using the 8.5"'s for a non winter square setup. This would assume that I buy another staggered set of 400M wheels (8 and 8.5s), although it seems that the 8.5s may not work on the front axle due to the offset.
I am running 8.5's et37 upfront and have this much room between the rim and strut:

(smooth spot on strut is just from my hand reaching up there, its not making any contact while driving)


I can fit a finger between the rim and strut but only to my first knuckle, second doesnt fit. If yours are et47, a 10mm spacer would give you the same fitment. I am only running 225.45.19's though, so baby stretch compared to a 255 that would be a bit more meaty:
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