Re: Different treadwear on rear wheels destroys differential ???

#11

On Mon, 30 Jun 2003 10:44:11 -0700, "fbloogyudsr"
<fbloogyudsr (AT) nwlink (DOT) com> wrote:

Quote:

"marlinspike" <marlinspike (AT) erols (DOT) com.nospam> wrote
"fbloogyudsr" <fbloogyudsr (AT) nwlink (DOT) com> wrote in message
For that matter, I've had to replace single tires on AWD vehicles
in very similar situations and never had problems - and that's three
diffs, not just one.

How big was the difference? If it was as big as 8mm vs 5.5...well then I
think you just got very lucky with your 4WD.

Oh, come on. All the BMW (current - not sure about the older 325iX)
AWD diffs are open. All the diffs on my AWD vans are open. Even
if one tire were completely worn, it wouldn't be a problem.

IMO, even with a lsd it wouldn't be a problem - because they're slipping
virtually all the time unless you're on a perfectly straight road. How
often does that happen?

The LSD clutch does not even engage unless there is a *significant*
difference in wheel speed.

#12

Juha wrote:

Quote:

I have a E46 323i Touring, but I do not know if it has a limited slip diff.
How could I test that? If I jack the rear of the car and rotate one of the
rear wheels, the other one rotates on opposite direction if it does not have
LSD and same direction if it has, right?

- Juha -

"Rob Munach" <xlengr (AT) pobox (DOT) commotion> wrote in message
Jack up one wheel and put the transmission in neutral. If you can rotate

that wheel, you do not have an LSD.

#13

Thank you all for giving me valuable information! I believe I'm going to do
tire rotation and buy my next tires from someone else....

And yes, I did jack my car up and did all those LSD tests you recommended.
I'm convinced I do not have LSD, just like quite many of you proposed.

Thanks again!

- Juha -

"Juha" <jmnyman_a (AT) kuumamaili (DOT) com> wrote

Quote:

Hi,

I had to replace one of my front tires (stock Michelin MXV4+ 205/55/16)
couple of months ago. At that time, tire salesman tried to make me buy two
tires instead of one, saying that it is a bad idea to have different sizes
of tires on same axle, especially on rear axle in my BMW. He claimed that
different treadwear on rear axle tires makes wheels rotate in different
speeds (of course), which will ruin differential (hmmm..). Well, I thought
this is bullshit, and even if it wasn't it doesn't apply to me because I'm
having new tire on front wheel. In addition, the rest of the tires had a
pretty good tread wear left (6mm), so I just bought one tire to replace
broken one.

Now it is time to do a tire rotation, and I'm hesitating because of this
salesman's words. Tell me if he is true with his claim that putting new
tire
(8mm of tread left) back with one of the original ones (5.5mm of tread
left)
will break my differential in long run? I just calculated that 2.5mm
difference in wheel radius makes 15.7mm in circumference, which means that
old one makes one additional round every 126 rounds = 251 meters.

Is he right?

- Juha -

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Re: Different treadwear on rear wheels destroys differential ???

BMW BMW General Discussions (alt.autos.bmw)

Re: Different treadwear on rear wheels destroys differential ??? - 06-30-2003 , 07:52 PM

Re: Different treadwear on rear wheels destroys differential ??? - 07-01-2003 , 05:52 AM

Re: Different treadwear on rear wheels destroys differential ??? - 07-01-2003 , 09:52 AM