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  #26  
Old 04-10-2020, 05:39 PM
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Ok great so, now Iím just thoroughly confused.

What Tyre sizes would you guys say is the correct combination then?


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Go to a site like Tire rack or Discount tire & put in your car information & see what tire sizes they recommend. They are pretty good at it. Also, the owners manual will show what sizes, even offsets that are recommended for your X3
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  #27  
Old 04-10-2020, 05:52 PM
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Use the size and BRAND indicated on the door jamb and ownerís manual. Hope that irreparable damage hasnít been done.


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  #28  
Old 04-10-2020, 06:44 PM
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Here is my Tyre placard in the door jamb. According to that my Tyre size combination is correct at 235/50/18 front and 255/45/18 rear so if thatís not correct then I donít know what to do!!

As for brand, well Iíve already forked out for the rears so Iíll have to go the same brand on the rear which is now organised and will be fitted.

Now that I think about it and after all of your inputs it makes sense. With differing Tyre diameters, the system thinks itís constantly slipping just a fraction and hence why the problem is so bad on hills.

Thanks guys and duke, fingers crossed I havenít cooked it!




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  #29  
Old 04-10-2020, 06:45 PM
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Originally Posted by alsd View Post
And if I shouldnít stagger my tyres, what am I supposed to put on? The OEM says that my tyres should be exactly was there are now so Iím confused.


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I donít recall the X3 coming with staggered tires from factory. Where do you read or see this?


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  #30  
Old 04-10-2020, 07:00 PM
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I donít recall the X3 coming with staggered tires from factory. Where do you read or see this?


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Gday Jeepo,

Well that picture is from my door, so thatís the first place.

Second, itís an m-sport package so sheís got m-Doppel spoke rims etc.

Iím guessing that most of you guys are in the states, Iím Australia so we probably got different models and specs to you guys hence the staggering stuff.


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  #31  
Old 04-10-2020, 07:08 PM
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transfer case actuator calibration?

As mentioned, the placard only applies to a specific set of tires from a specific manufacturer or 2. If the brands and wear differ, you may as well have different sized tires on it. Your ďthinking on itĒ is exactly correct. Tires MUST be equal size and wear within 1%. Do that and your problems should go away, assuming you havenít caused irreparable damage to the transfer case.

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  #32  
Old 04-10-2020, 07:39 PM
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My M-Sport came with OEM staggered tire and wheel sizes too.
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  #33  
Old 04-10-2020, 08:16 PM
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Originally Posted by dukedkt442 View Post
As mentioned, the placard only applies to a specific set of tires from a specific manufacturer or 2. If the brands and wear differ, you may as well have different sized tires on it. Your ďthinking on itĒ is exactly correct. Tires MUST be equal size and wear within 1%. Do that and your problems should go away, assuming you havenít caused irreparable damage to the transfer case.

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Yep fingers crossed!


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  #34  
Old 04-10-2020, 08:17 PM
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Originally Posted by BMWaufKS View Post
My M-Sport came with OEM staggered tire and wheel sizes too.


Are you in the US too?


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  #35  
Old 04-11-2020, 03:45 AM
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I had an informative chart listing tire (acceptable) sizes for the X3 down to the country...I've lost and changed phones so many times since I last consulted.
Ah! Here it is...hope this helps:
BMW X3 2005 - Wheel & Tire Sizes, PCD, Offset and Rims specs - Wheel-Size.com
https://www.wheel-size.com/size/bmw/...m-30i-usdm-225
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  #36  
Old 04-11-2020, 05:12 AM
alsd alsd is offline
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Ah bugger!

Well I canít go wrong if I follow the tyre placard.

Iím just surprised at how changing tyres on the rear but not the front has had such a detrimental effect.

I really hope that having fresh rubber all round helps this.


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  #37  
Old 04-11-2020, 02:16 PM
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Quote:
Originally Posted by alsd View Post
Ah bugger!

Well I canít go wrong if I follow the tyre placard.

Iím just surprised at how changing tyres on the rear but not the front has had such a detrimental effect.

I really hope that having fresh rubber all round helps this.


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It probably makes more sense the issue occurs with the rears because thatís where 70% of the torque is going. Iím surmising here, but if the vehicle ďthinksĒ thereís slippage at the front, itíll shift torque to the rear, lessening any binding. With it ďthinkingĒ the rears are slipping, itís transferring more torque to the front axle that doesnít need it, and you feel the binding as the two axles fight each other. One thing is definitely certain, catastrophic damage will occur somewhere because of it, most like the TC clutches first. As soon as you get a proper set of spec spec tires on the thing, youíll need to change the T case fluid ASAP because the more you drive it, the more the fluid turns to sandpaper. Use only the BMW fluid or a fluid meeting its specs (I have Shell S tec in mine which I believe is the OE supplier and itís been fine).


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  #38  
Old 04-14-2020, 02:57 AM
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So I had the front tyres installed today. Same brand (no not the BMW recommended brands, just bought a house and am literally too poor to afford that level of investment right now!) and all according to spec.

Whilst itís not as bad. The problem remains.

Iím going to change the TC oil and then get the adaptations reset but after that Iím outta ideas.

Ready to set the fu$king thing on fire now.


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  #39  
Old 04-14-2020, 03:59 AM
BMWaufKS BMWaufKS is offline
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Have you reset the SAS? And checked/cleaned the wheel speed senders and their reluctor rings?
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  #40  
Old 04-14-2020, 04:10 AM
alsd alsd is offline
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I have not!

Iíll give it a try. I got so caught up in this tyre business that I forgot all about your recommendation!

Will give it a go and see how we go with that.


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  #41  
Old 04-15-2020, 01:31 AM
alsd alsd is offline
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Originally Posted by alsd View Post
I have not!

Iíll give it a try. I got so caught up in this tyre business that I forgot all about your recommendation!

Will give it a go and see how we go with that.


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SAS reset, no luck.

Havenít been able to check the reluctors yet.


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  #42  
Old 04-21-2020, 11:16 PM
alsd alsd is offline
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So just to update.

Today I changed the TC oil. The stuff that came out was black and I swear there were particles in it.

In went the new stuff.

After the first quick drive, I donít want to jinx myself but it appears to be way better.

I think I still have firing issues in the engine so will be investigating that further but for now, I believe my jerking is 90% gone.

Thanks to all for the advice, was great to have it..... something tells me Iím not out of the woods yet though.


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