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F10 / F11 (2011 - 2016)
The sixth generation of the BMW 5 Series Sedan (F10) was produced from 2011 - 2016 with LCI updates arriving in 2014. In the US BMW offered a hatchback 5 Series Gran Truismo (F07) and the rest of the world also go a Station Wagon/Touring version F11.

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  #1  
Old 12-18-2015, 02:52 AM
MunichMark MunichMark is offline
Munich Mark - 2014 535XD
Location: Freiburg, Germany
 
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Staggered Wheels Setup on X-Drives

Just a note;

Anytime you change Rims and Tires to a different sized setup it needs to be input into the Cars system by a BMW Dealer or I also imagine a Coder can do it too...

I have seen a few cases over here where Folks change Winter Tires or go with big changes with Summer Tires and then they have transfer gearbox issues.

BMW will not be in much of a mood to cover you if this was not done at or in cooperation with an authorized Dealer...

The X Drive system depends a lot on sensitive input data from all 4 wheels and more. Just a suggestion to remember to have this covered as it may save you some unpleasant and costly experiences !
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  #2  
Old 12-18-2015, 05:40 AM
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WilliCO WilliCO is offline
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Location: Castle Pines, Colorado
 
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Staggered Wheels Setup on X-Drives

Quote:
Originally Posted by MunichMark View Post
Just a note;

Anytime you change Rims and Tires to a different sized setup it needs to be input into the Cars system by a BMW Dealer or I also imagine a Coder can do it too...

I have seen a few cases over here where Folks change Winter Tires or go with big changes with Summer Tires and then they have transfer gearbox issues.

BMW will not be in much of a mood to cover you if this was not done at or in cooperation with an authorized Dealer...

The X Drive system depends a lot on sensitive input data from all 4 wheels and more. Just a suggestion to remember to have this covered as it may save you some unpleasant and costly experiences !
Yes. The xDrive system pays a lot of attention to the rate of rotation of the axles/wheels, and changing tire diameter affects that. The really bad thing to do is to put tires of varying diameters on different axles - this forces the axles to turn at varying rates, which creates havoc with the AWD traction control computer. A staggered setup is OK on an xDrive system as long as the diameters of the wheels+tires are all the same.

I'm in a PM conversation right now with a guy who bought staggered M3 wheels for his xDrive E60. Somehow the tires have the same profile height on each axle (35) but he has 245 fronts and 265 rears. His car is, predictably, complaining, and he's going to have to buy some 30-profile tires for his back wheels, I think.
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2013 535i xDrive M-Sport (Retired) | 2005 545i Sport (Retired - best of the litter) | 2001 X5 3.0 Sport (Retired)

Last edited by WilliCO; 12-18-2015 at 07:03 AM.
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  #3  
Old 12-18-2015, 07:23 AM
ImolaRedM ImolaRedM is offline
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Something isn't adding up, Mark.

Explain what needs to be input and into what system of the car? Where is it mentioned in the manual? I may have missed it but I certainly don't recall reading anything about it.

I purchased my 535dx with staggered wheels from the factory. They are 245's up front and 275's in the rear. These are my summer tires and run on 19" rims. For the winter months I purchased a set of BMW wheel from the dealer that are 245's on all corners riding on 18" wheels. I have about 20k miles on the summer tires and about 10k miles on the winter setup with no issues. These sizes are mentioned in the manual but there is no mention of reprogramming the car.

It is true of any modern car that you need the same rotational size tired all around. The ABS and driveline (especially for AWD) will complain if one wheel or one axle rotates significantly more than the others. Overly small rotational diameters or overly large rotational diameters will cause problems with final drive ratios but generally this won't do damage if the diameter is consistent on all corners. However, this may cause the engine to feel anemic or breaking to take longer (larger tires). The ABS and driveline will accommodate slight differences due to tire wear and difference in air pressure. The important thing to remember is to keep the rotational size the same on the corners. The car won't know how wide your tire is as long as it's the same diameter.
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  #4  
Old 12-18-2015, 07:56 AM
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WilliCO WilliCO is offline
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Quote:
Originally Posted by ImolaRedM View Post
Something isn't adding up, Mark.

Explain what needs to be input and into what system of the car? Where is it mentioned in the manual? I may have missed it but I certainly don't recall reading anything about it.

I purchased my 535dx with staggered wheels from the factory. They are 245's up front and 275's in the rear. These are my summer tires and run on 19" rims. For the winter months I purchased a set of BMW wheel from the dealer that are 245's on all corners riding on 18" wheels. I have about 20k miles on the summer tires and about 10k miles on the winter setup with no issues. These sizes are mentioned in the manual but there is no mention of reprogramming the car.
You asked Mark and not me - and I'm not sure about the need to reprogram the car either. I do believe that a 275/35/19 tire and a 245/40/19 tire have about the same rotational diameter, so swapping out across those sizes might not confuse your car at all.
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  #5  
Old 12-18-2015, 12:24 PM
belal242 belal242 is offline
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I have never heard of this for any BMW. I have owned and modified a couple of Xdrives with no issue. The roll diameter as stated by others is your only true concern. I'd appreciate any suggestions like this to be supported by some reference points.
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  #6  
Old 12-18-2015, 02:39 PM
JeffDunes JeffDunes is offline
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Quote:
Originally Posted by ImolaRedM View Post
Something isn't adding up, Mark.

Explain what needs to be input and into what system of the car? Where is it mentioned in the manual? I may have missed it but I certainly don't recall reading anything about it.

I purchased my 535dx with staggered wheels from the factory. They are 245's up front and 275's in the rear. These are my summer tires and run on 19" rims. For the winter months I purchased a set of BMW wheel from the dealer that are 245's on all corners riding on 18" wheels. I have about 20k miles on the summer tires and about 10k miles on the winter setup with no issues. These sizes are mentioned in the manual but there is no mention of reprogramming the car.

It is true of any modern car that you need the same rotational size tired all around. The ABS and driveline (especially for AWD) will complain if one wheel or one axle rotates significantly more than the others. Overly small rotational diameters or overly large rotational diameters will cause problems with final drive ratios but generally this won't do damage if the diameter is consistent on all corners. However, this may cause the engine to feel anemic or breaking to take longer (larger tires). The ABS and driveline will accommodate slight differences due to tire wear and difference in air pressure. The important thing to remember is to keep the rotational size the same on the corners. The car won't know how wide your tire is as long as it's the same diameter.
+1 I'm with Imola on this.. Same overall diameter on the of the outside of the tire is the key.
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  #7  
Old 12-18-2015, 10:49 PM
MunichMark MunichMark is offline
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Location: Freiburg, Germany
 
Join Date: Jun 2014
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Just trying to help - sorry !

Hey Guys, just trying to help, if you do not believe ask your Dealer... In Germany any tire changes are input into the Car's Electronics, that simple, in US should be the same.

A helpful tool is found if you Google Tire Size Calculator, etc... and I know that some will also not believe that width, spacers, weight, etc.. also make a difference, although it's marginal...
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  #8  
Old 12-20-2015, 09:17 AM
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550newbie 550newbie is offline
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Here's a thread you should check out: http://www.bimmerfest.com/forums/sho...=transfer+case
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  #9  
Old 12-20-2015, 09:49 AM
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WilliCO WilliCO is offline
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Location: Castle Pines, Colorado
 
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Quote:
Originally Posted by 550newbie View Post
Here's a thread you should check out: http://www.bimmerfest.com/forums/sho...=transfer+case
In that story, either the OP doesn't provide all of the relevant info, or the dealer is being quick to point at aftermarket equipment to deny the warranty claim. Likely both.

Math is not subjective. Math doesn't "depend". If he had a tire setup on all 4 corners of his car where the rotational diameter is the same (or close enough to make no matter, as he suggests), there would be no effect to the transfer case.
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