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      07-01-2023, 01:16 PM   #1
bmwz750
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Wheel size setup question

Hello everyone, I am new on this forum. I have a question about tires/wheel size for BMW G11 750d xDrive - 2018.

When I bought the car earlier this year, the winter set came with it (Style 647M 19"). Right now, the car is on 20" Style 648M (staggered) and the ride is great.

My concern is the following:

I've recently noticed that my winter set is 8.5J on all 4 wheels, while front tires are 245/45/19 and rear 275/40/19.

According to specs, the rear 19'' wheels should be 9.5J with 275/40/19. So Im wondering is this safe to put on and drive, having in mind that xDrive is sensitive to wheel/tire setup and can be damaged if specs are not proper - as far as Im aware.

Has anyone tried this setup on a G11?

Thanks.
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      07-01-2023, 02:39 PM   #2
Raimo5
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Hello, and welcome to BimmerPost.

Style 647M actually comes in two different flavors. It can either be 8,5Jx19 all around with 245/45/19 in all corners, or a staggered setup with 9,5Jx19 with 275/40/19 at rear. If you have 8,5J wheels all around then you are running oversized tires on the rear wheels.

G11/12 was designed with max front tire width of 245mm, regardless of wheel size. That is why we have staggered setups starting with 19" wheels. Fitting anything wider in front can have severe impact on handling and clearances.

xDrive wont be damaged by slight mismatch of tires. The car is smart enough to do compensations on the fly based on feedback systems, but the initial maps that might be deployed during DSC regulations might be skewed.

The more you deviate, the worse it gets, up to a point where you might receive drivetrain or DSC errors and shutdown of different facilities like power transfer to front wheels and degraded stability protection.
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      07-01-2023, 04:04 PM   #3
bmwz750
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Quote:
Originally Posted by Raimo5 View Post
Hello, and welcome to BimmerPost.

Style 647M actually comes in two different flavors. It can either be 8,5Jx19 all around with 245/45/19 in all corners, or a staggered setup with 9,5Jx19 with 275/40/19 at rear. If you have 8,5J wheels all around then you are running oversized tires on the rear wheels.

G11/12 was designed with max front tire width of 245mm, regardless of wheel size. That is why we have staggered setups starting with 19" wheels. Fitting anything wider in front can have severe impact on handling and clearances.

xDrive wont be damaged by slight mismatch of tires. The car is smart enough to do compensations on the fly based on feedback systems, but the initial maps that might be deployed during DSC regulations might be skewed.

The more you deviate, the worse it gets, up to a point where you might receive drivetrain or DSC errors and shutdown of different facilities like power transfer to front wheels and degraded stability protection.

Thank you. To my understanding, to be safe and avoid damage I have two options:

a) Keep 8.5J all around but switch rear tires to 245/45/19
b) Replace rear wheels with 9.5J version and keep 275/40/19 tires

Which one would you say is a better option for handling/driving experience?

Im also thinking of selling the winter set as is and getting winter tires for my current summer setup - style 648M 20".
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      07-01-2023, 04:32 PM   #4
Raimo5
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If it was me, I would get 245/45's for the rear. New rubber is cheaper than wheels, and especially at that tire size. If I was shopping for a new set of rims, then I would go staggered where combination permits.

If you are going with good tires, then 245's are well capable of planting all the power of 750dX and it will handle great. Not to mention lower rolling resistance and NVH. Latter two are very much a subject of tire choice.
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