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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires -- Sponsored by The Tire Rack > OEM 666M Wheels - F31 xDrive Fitment
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      04-19-2019, 06:50 PM   #1
nordicastar
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Smile OEM 666M Wheels - F31 xDrive Fitment

Fellow Bimmer Owners,

I've looked far and wide on the forums for info. regarding this. There doesn't seem to be any concrete information on this.

Will it be ok for an F31 xDrive to run OEM 20" 666M wheels?
265/30 R20 94Y - 9Jx20 ET29
285/30 R20 99Y - 10Jx20 ET40

Thanks to anyone who can provide some insight on this.

Cheers!



***EDIT***: Did some more digging and realized the diameter difference is:
26.3"
26.7"
+1.5%

Will this be a huge problem? Or is there a recommended running for the tires? Or should I just scrap the idea altogether?
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Last edited by nordicastar; 04-19-2019 at 07:01 PM.. Reason: Updated Information / Research
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      04-19-2019, 07:11 PM   #2
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You can eliminate diameter difference of the wheel by choosing appropriate tyre sizing (taller sidewall at front to match shorter sidewall at rear)

There is then some camber adjustment needed but other than that it's not impossible to do.
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      04-19-2019, 11:13 PM   #3
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you need to change the front and rear tire sizes to 235/35/20, 275/30/20 both diameters are the same at 26.5", perfect for x-drive. 275 will sit squarely on the 10" wide rear but 235/35/20 will be slightly stretched up front...
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      04-20-2019, 12:09 AM   #4
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You'll be fine. Plenty of us with square setups that have had the transfer case go out at 20-40k
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