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F80/F82/F83 M3 and M4 (2015 - Current)
F80 BMW M3 sedan, F82 BMW M4 coupe and F83 M4 convertible forum. This 5th generation M3 and all new M4 features a 3.0 liter twin turbo engine (engine code S55) 425hp and 406lbs of torque! Heavy use of light weight materials makes this generation lighter and faster then the outgoing E9x M3.

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Old 09-12-2019, 06:46 AM
Paszekj Paszekj is offline
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sizing of winter wheels/tires

I have an f80 M3 competition package with front wheels 265/30zr20 & rear 285/30zr20.

A friend with an older M4 just traded it in and the dealer didn't want his extra set of wheels/ winter tires & he's offering to give me a good deal on them. They're 235/40R18. I realize they'll be a little smaller diameter and obviously width.
I'm planning to bolt one on and and make sure it fits with the bolt pattern and bolt length but any opinions on the width? FWIW, Tire Rack's calculator recommends a 255 width.
I see the advantages of a thinner winter tire but is that too narrow? I'm sure it's not ideal but he's asking $400 for the set with fairly new winter tires so it would be a good deal.
I don't really plan to drive it in snow but it get's awful cold here and it would be nice to have the option to drive it most of the year. thanks.
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Old 09-15-2019, 11:30 AM
Paszekj Paszekj is offline
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Any thoughts? thanks
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Old 09-16-2019, 10:35 AM
mdechnik mdechnik is offline
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When you're in the snow, an 8.5" tire up front and 9" or 9.5" in the rear is far more effective than a 10" tire. And the 18" diameter wheel gives you more tire to prevent a bent rim in the event that you hit a pothole. There was probably some logic your friend had selected them in the first place for his M4.
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Old 09-16-2019, 05:26 PM
Paszekj Paszekj is offline
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Thank you!
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Old 09-17-2019, 06:35 AM
poker838 poker838 is offline
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Could you run those sizes through a tire size calculator and see how large the height difference is? In my head, 255/40/18 OE spec going to 235/40/18 means the sidewall will be shorter. You'll need more revs per mile (speedometer and odometer overstated) and since it's shorter you're also going to lose some ground clearance so it might be easier to drag/hit things on the ground.

Between an F80 and F82 the wheel and bolt specs should be the same. I'm not concerned on that front.
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Old Yesterday, 06:43 PM
Paszekj Paszekj is offline
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appreciate the input. Im not really worried about a slightly smaller tire. I can always upside when I replace them. As long as the narrower wheel isn't an issue I think Im fine considering they're a good deal.
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