OEM 666M Wheels

nordicastar · 04-19-2019, 05:50 PM

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?

CoopersF15 · 04-19-2019, 06:11 PM

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.

alohasurftoad · 04-19-2019, 10:13 PM

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...

328iX · 04-19-2019, 11:09 PM

You'll be fine. Plenty of us with square setups that have had the transfer case go out at 20-40k

04-19-2019, 05:50 PM	#1
nordicastar Registered 0 Rep 2 Posts Drives: F31 BMW 320d xDrive M Sport Join Date: Mar 2019 Location: Switzerland iTrader: (0)	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? __________________ Current Baby - F31 320d xDrive M Performance Last edited by nordicastar; 04-19-2019 at 06:01 PM.. Reason: Updated Information / Research*
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04-19-2019, 06:11 PM	#2
CoopersF15 Second Lieutenant 95 Rep 274 Posts Drives: F15 Xdrive 40e Performance Join Date: Apr 2017 Location: . iTrader: (0)	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. __________________ 2017 F15 40i ePerformance -M Sport
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04-19-2019, 10:13 PM	#3
alohasurftoad Brigadier General 3072 Rep 4,315 Posts Drives: 440i gran coupe w/mppsk Join Date: Apr 2015 Location: hawaii iTrader: (0)	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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04-19-2019, 11:09 PM	#4
328iX David 786 Rep 2,010 Posts Drives: 2015 328iX F31 Join Date: Nov 2018 Location: Temecula, CA iTrader: (0)	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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