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  #31  
Old 07-22-2011, 11:36 PM
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Quote:
Originally Posted by ducati2242 View Post
Yea JCL had already answered with a relevant response . Didnt need any help from you . Some tossers just cant help but interfering though
You still don't get it. Good luck with everything buddy.
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  #32  
Old 07-23-2011, 02:24 AM
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Originally Posted by rph74 View Post
Since there is differing opinion here, I decided to talk to the guys at the local dealership. They were nice enough to give me a tire gauge to take home with me since I had my 540i on me at the time. They told me that they feel comfortable with 4/32nds of an inch difference between front and rear tires max. The difference for me was 5/32nds so I have decided to go ahead and replace the fronts. It may end up being overkill, but I guess I'm too damn anal and overcautious to just look the other way on this one. I'll spend the extra $350 for peace of mind.

Thanks for all your input guys!
RPH74, you made the right decision by replacing all four, good piece of mind having good rubber all around. I was in the same situation a few years ago and just replaced the rears which ended up being fine for my situation - I have 117K miles now and no damage to the tranny or transfer case as a result. This past winter the fronts were getting a bit thin and were noticeable in the bad winter we had in the Northeast, the start/stops in the snow were just not very good. This spring, I replaced all four just to get back to a good rubber baseline even though the rears were just fine. I kinda felt bad about tossing out two good tires, but my wife drives our X5 alot with the kids, so I felt a few hundred $$$'s is worth it. Keep us posted on your ride!
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  #33  
Old 06-10-2019, 03:11 PM
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Originally Posted by JCL View Post
With the X5, you run the risk of damage to the transfer case for pre x-drive models (2000-2003). It has shown up as damaged splines.

With x-drive models (2004 onwards), the clutch plates in the transfer case allow for some discrepancy, but if it is too large you wear the clutch plates.

With both transfer cases, you can get nuisance DSC errors due to tire size discrepancies.

BMW has the same spec for maximum differences for both versions.

If the tires are the same size and brand/model front and rear, and one end is new while the other is up to half worn, you should be fine. I would put the new tires on the front, however. You will often have higher inflation pressure on the rear due to load carried, and that helps compensate for wear differences. Apart from that, you depend on the fronts for steering and braking.

@JCL, your point regarding the x-drive models (2004 onwards) being afflicted by using differing tire size, mine (a nov 2004 built 3.0d) is not a xDrive no mention of this anywhere on 'packet' or manual, had a case over the last few years where left side tires were substantially more worn over the entire circufmerence of the tires than the right so rotated them (they werent directional), never had a dsc error popup, just be good to know if there is any hard fast empirical data for the e53 where owners have used mismatched tires (as you say most had 17" stock rear andt front) and has lead to transfer case failure and the like.. Reading online today have seen that some of the much newer bmws are more susceptible, but for our X5s is this something as I mentioned in another post that would just go kaput on the highway or would we get a warning?
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  #34  
Old 06-10-2019, 04:43 PM
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Originally Posted by omodos View Post
... mine (a nov 2004 built 3.0d) is not a xDrive no mention of this anywhere on 'packet' or manual, ...
Why make you say your 3.0d is NOT xDrive? It almost certainly is.

You have a "facelift" (LCI) E53 X5 and they all have xDrive. The xDrive driveline was fitted to all LCI E53 X5 produced, starting in late 2003.

And so yes, tyres are important. You need to keep the rolling circumference of all tyres with a couple of percent of each other or you risk wearing out the clutch packs in the transfer case.

Documented evidence of this happening...? Dunno. But I don't want to risk it...
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  #35  
Old 06-10-2019, 05:11 PM
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So i found this:

Quote:
According to the experts at TireRack, the tires on xdrive cars can be different sizes from original equipment (but must be within 3% of original tire diameter), and they need to be within 1% (not to exceed) diameter size of each other to not cause problems.
That works out to just about 4/32" difference in tread depth allowed front to back. I don't believe the 3% of OE for overall size as long as they fit and are all the SAME size or within 1% rolling circumference.

That is for x-drive. i think the pre LCI can have up to 3% difference front to back axle.
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  #36  
Old 06-11-2019, 04:37 AM
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Quote:
Originally Posted by wpoll View Post
Why make you say your 3.0d is NOT xDrive? It almost certainly is.

You have a "facelift" (LCI) E53 X5 and they all have xDrive. The xDrive driveline was fitted to all LCI E53 X5 produced, starting in late 2003.

And so yes, tyres are important. You need to keep the rolling circumference of all tyres with a couple of percent of each other or you risk wearing out the clutch packs in the transfer case.

Documented evidence of this happening...? Dunno. But I don't want to risk it...
Spoke to my mechanic and he confirmed seeing it (drivetrain issue) on X3s with mismatched tires, so gonna go get em changed today
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