[peteinpa]

Hi folks, posted a similar question in the general forum. I have an opportunity to purchase a set of staggered 811m wheels for my 540xi M-Sport.
Wheel/tire are 275/35 r20 front 285/35 r20 rears. As per the seller all wheels are +28 ET. Will these fit my 540? Thanks.

[TEF]

Have you any idea of the other measurements of these wheels other than the offset of 25mm? Specifically if the wheels are from the last generation of BMWs (i.e. F10), they will not fit?

[Norris83]

Originally Posted by peteinpa

Hi folks, posted a similar question in the general forum. I have an opportunity to purchase a set of staggered 811m wheels for my 540xi M-Sport.
Wheel/tire are 275/35 r20 front 285/35 r20 rears. As per the seller all wheels are +28 ET. Will these fit my 540? Thanks.

The rears will stick out so you might have to put a 275/35/20 tires. The offset should be 10mm higher.
The fronts will fit no problem but a little aggressive. You can fit 9.5"x20 28mm with 275/35/20 front and rear on a g30 for a perfect fitment.

[peteinpa]

Originally Posted by Norris83

The rears will stick out so you might have to put a 275/35/20 tires. The offset should be 10mm higher.
The fronts will fit no problem but a little aggressive. You can fit 9.5"x20 28mm with 275/35/20 front and rear on a g30 for a perfect fitment.

Thanks. I did test fit the front and they looked good. Haven't tried the rear yet. I assume you are right as it is aggressive. Thanks for the tire size suggestion.

[G30 B58]

Originally Posted by peteinpa

Thanks. I did test fit the front and they looked good. Haven't tried the rear yet. I assume you are right as it is aggressive. Thanks for the tire size suggestion.

So what did you buy?

[peteinpa]

I ended up with 706M wheels with tires. They have the Michelin high performance summer tires, which I am thinking of switching out. Rears are like brand new. Fronts have plenty of tread. I may opt of the Michelin all seasons so I can get 3 seasons on these. Will keep my 664 wheels and tires for winter.

[peteinpa]

Originally Posted by Norris83

The rears will stick out so you might have to put a 275/35/20 tires. The offset should be 10mm higher.
The fronts will fit no problem but a little aggressive. You can fit 9.5"x20 28mm with 275/35/20 front and rear on a g30 for a perfect fitment.

If the rears are 10.5 wide can I still go with a 275?

[Norris83]

Originally Posted by peteinpa

If the rears are 10.5 wide can I still go with a 275?

Yes, they will still stick out. The issue is the offset is 28mm and it should be 38-41mm.

[G30 B58]

Not as easy or cheap as it sounds but make a square set out of 4 front M8 wheels for your 540.

[peteinpa]

Ok so did the test fit. There is a slight poke but may be live able.

[G30 B58]

...and still no side shot of the new wheels.

[NTTY]

9.5 and 10.5" ET 28 will both be too agressive, especially rear ones. It will rub under load and it could be dangerous at high speed.

[peteinpa]

Originally Posted by NTTY

9.5 and 10.5" ET 28 will both be too agressive, especially rear ones. It will rub under load and it could be dangerous at high speed.

That is concerning, first I am hearing about potential rubbing. I used this calculator www.willtheyfit.com to compare my 19" 664M that are 8" with an offset of 30, from what I see they should fit. Even checked with my BMW dealer and they said should be OK also. Where do you believe they will rub? I can mount again and check specifically for clearance. Thanks

[peteinpa]

Originally Posted by G30 B58

...and still no side shot of the new wheels.

Sorry here is one but not mounted.

[NTTY]

Originally Posted by peteinpa

That is concerning, first I am hearing about potential rubbing. Tcked with my BMW dealer and they said should be OK also. Where do you believe they will rub? I can mount again and check specifically for clearance. Thanks

Because I use 10.5" ET 41 rear wheels and under certain conditions, it will slightly rub under the fender (that's also because I have the rear wheels steering, I must admit). In my case, the rear tire side walls (295/30/20) are outside the fender.

This is a picture of mine with load trunk and my son at the back only, not much space left:



Note that camber will increase under load, this is why it's ok for me, but really, there's no space left under the fenders.

Below you can see the side walls of the tires poking out the fender:


Different view:


Your rear wheels will not only poke out by an additional 13mm (ET 28 instead of ET 41) that is a huge difference, they will also have a much bigger tires because of the profile (35 instead of 30). That means you're off specs at rear by 5%, which is a legal concern at this difference and is likely to cause issues with the DSC managing ABS, x-drive, traction control, etc...

The calculator you used does not tell you it fits, it only shows the differences. At least it shows the speedo error, which is a first indicator of the issue since your are -3% front and -5.81% rear. Basic recommendation is to stay below 3% and also avoid significant différences between front and rear because of the x-drive which is calibrated stock with 0% difference and a small tolerance (unknown, unfortunately).
The M5 has bigger wheel arches, wider body, updated suspensions and tuned DSC control unit to accommodate the bigger wheels.

The BMW dealer who told you "it should be ok" is not your friend, and does not know anything about this (not a surprise).

Even if you fit correct tire sizes for your car on these wheels, I suspect issues under load on the rear axle. It might be ok when you'll test in your neighborhood, but it will be different with people in your car when driving on a bumpy highway.

Cheers

[peteinpa]

Thank you NTTY for taking the time to post and all the information you have provided.
The way I see it I have a few options.
1) Sell the set and move on.
2) Sell the rears and pick up a set of the 9.5 fronts as Norris suggested.
3) Mount a 275/35/20 on the 10.5 rims. All tires will be the same rolling diameter which should reduce xdrive issues etc... But will still poke and potentially run into the rubbing issue under load.

The only question I have is that the M5 is also AWD and these are the OE sizes, so wondering if the Xdrive can handle it in the g30. When comparing the 275 and the 285 on the wheel calculator the speedo variance is .01% the diameter variance is about 1%.

Plan all along was to replace the tires so I could go with 30 vs. 35 all around.

Head hurting this early in the morning First world problems I guess. More to come.

[NTTY]

Originally Posted by peteinpa

Thank you NTTY for taking the time to post and all the information you have provided.
The way I see it I have a few options.
1) Sell the set and move on.
2) Sell the rears and pick up a set of the 9.5 fronts as Norris suggested.
3) Mount a 275/35/20 on the 10.5 rims. All tires will be the same rolling diameter which should reduce xdrive issues etc... But will still poke and potentially run into the rubbing issue under load.

The only question I have is that the M5 is also AWD and these are the OE sizes, so wondering if the Xdrive can handle it in the g30. When comparing the 275 and the 285 on the wheel calculator the speedo variance is .01% the diameter variance is about 1%.

Plan all along was to replace the tires so I could go with 30 vs. 35 all around.

Head hurting this early in the morning First world problems I guess. More to come.

You're welcome.

The x-drive is obviously tuned on the M5. The electric motor closing or opening the x-drive multidisc clutch can be electronically adjusted in the x-drive control unit. I suppose this is how they adjust it to satisfy different rolling circumferences.

In reality, and for all x-drive units, there are some small variations due to various tolerances. This is determined during production and a 4-digit code can be seen on the x-drive unit. This code is to be enter in the electronic control unit so that the correct pressure is applied by the electric motor to the multi-clutch disc.

Our non-M cars are tuned to have the same tire diameter front and rear. The M5 has different diameters, even for winter wheels and tires (265/40/19 and 285/40/19).

In your list of options, I see 1) as the easiest, and possibly 2). But you need to use proper tire sizes. 275/35/20 is off specs (4% increase) and would void the insurance in my country at least.

Front should be 245/35 or 255/35 or 265/35.
Rear can be 275/30, 285/30 or 295/30, or same as front, of course.

Cheers

[G30 B58]

Originally Posted by peteinpa

Thank you NTTY for taking the time to post and all the information you have provided.
The way I see it I have a few options.
1) Sell the set and move on.
2) Sell the rears and pick up a set of the 9.5 fronts as Norris suggested.
3) Mount a 275/35/20 on the 10.5 rims. All tires will be the same rolling diameter which should reduce xdrive issues etc... But will still poke and potentially run into the rubbing issue under load.

The only question I have is that the M5 is also AWD and these are the OE sizes, so wondering if the Xdrive can handle it in the g30. When comparing the 275 and the 285 on the wheel calculator the speedo variance is .01% the diameter variance is about 1%.

Plan all along was to replace the tires so I could go with 30 vs. 35 all around.

Head hurting this early in the morning First world problems I guess. More to come.

Pete,

Here's another thought to make them visually more appealing. Add the OEM fender guards or OEM extension that the M5(?) and or M550 have on them.

Do you know what I'm talking about? You can get them in plastic (OEM) and even CF. Here's a link from IND: https://ind-distribution.com/collect...-extension-set

[HerkHealer]

Originally Posted by G30 B58

Pete,

Here's another thought to make them visually more appealing. Add the OEM fender guards or OEM extension that the M5(?) and or M550 have on them.

Do you know what I'm talking about? You can get them in plastic (OEM) and even CF. Here's a link from IND: https://ind-distribution.com/collect...-extension-set

This is a great idea. Unless you dont care that the bottom of your bumper will get pitted and scratched up due to all the dirt/grit those tires will throw at it.

[peteinpa]

Originally Posted by HerkHealer

This is a great idea. Unless you dont care that the bottom of your bumper will get pitted and scratched up due to all the dirt/grit those tires will throw at it.

Mud flaps

[HerkHealer]

Originally Posted by peteinpa

Mud flaps

Yep, that's another option and probably cheaper.

[NTTY]

Originally Posted by G30 B58

Pete,

Here's another thought to make them visually more appealing. Add the OEM fender guards or OEM extension that the M5(?) and or M550 have on them.

Do you know what I'm talking about? You can get them in plastic (OEM) and even CF. Here's a link from IND: https://ind-distribution.com/collect...-extension-set

It won't unfortunately change anything about fact these wheels/tires are too big. It might even make it worse.