XDrive Tire Difference

fcro · 01-09-2024, 07:45 PM

Hello, I know this topic has been discussed before, but I do have a question. I’ve heard a rule of thumb is 1% tire circumference difference. I’ve also heard of people running up to 3-4% without issue. If I get a setup that is for sale currently that is about 1.9-2.1% difference would that cause any issues with the Xdrive/transfer case? Thanks

marcthedark · 01-12-2024, 02:01 PM

On the M240ix the stock size is 225/40-18 and 245/35-18 which is a 1.2% difference so the 1% can't be correct

Billfitz · 01-12-2024, 03:22 PM

Agreed. The 1% figure is spot on with old totally mechanical AWD configurations, but the electronic xDrive has more wiggle room. But I wouldn't be going much beyond 2%.

AshtonPJT · 02-05-2024, 07:22 PM

I’m at 2.7 and you can definitely tell it’s not perfect

zjaku · 03-21-2024, 02:52 PM

2018 340i xDrive msport. Currently everything stock.
Thinking of purchasing some TE37 SL 18x9.5 et35 squared set.
Would run 255/40/18 or 245/40/18 to keep similar rolling diameter.
Think I’ll probably have to put some spacers for the fronts.
Anyone else run a similar setup or know more?

01-09-2024, 07:45 PM	#1
fcro Registered 0 Rep 1 Posts Drives: 440ix Join Date: Jan 2024 Location: chicago iTrader: (0)	XDrive Tire Difference Hello, I know this topic has been discussed before, but I do have a question. I’ve heard a rule of thumb is 1% tire circumference difference. I’ve also heard of people running up to 3-4% without issue. If I get a setup that is for sale currently that is about 1.9-2.1% difference would that cause any issues with the Xdrive/transfer case? Thanks
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01-12-2024, 02:01 PM	#2
marcthedark Lieutenant 120 Rep 410 Posts Drives: M240i xdrive Convertible Join Date: Apr 2017 Location: Phoenix Metro Area iTrader: (0)	On the M240ix the stock size is 225/40-18 and 245/35-18 which is a 1.2% difference so the 1% can't be correct
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01-12-2024, 03:22 PM	#3
Billfitz Lieutenant General 8243 Rep 16,079 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Agreed. The 1% figure is spot on with old totally mechanical AWD configurations, but the electronic xDrive has more wiggle room. But I wouldn't be going much beyond 2%.
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02-05-2024, 07:22 PM	#4
AshtonPJT BM3 Tuner 281 Rep 262 Posts Drives: BMW X3M40 2019 Join Date: Jun 2022 Location: Flordia iTrader: (0)	I’m at 2.7 and you can definitely tell it’s not perfect __________________ 2019 BMW X3M40I - VRSF Downpipe, XHP Stage 3, Nostrum Stage 1 Injectors, VTT PCV and Oil cap. Paul Johnson Tunes Shop/Development Car
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03-21-2024, 02:52 PM	#5
zjaku Registered 0 Rep 1 Posts Drives: 2018 BMW 340i xDrive MSport Join Date: Mar 2024 Location: Tennessee iTrader: (0)	2018 340i xDrive msport. Currently everything stock. Thinking of purchasing some TE37 SL 18x9.5 et35 squared set. Would run 255/40/18 or 245/40/18 to keep similar rolling diameter. Think I’ll probably have to put some spacers for the fronts. Anyone else run a similar setup or know more?
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