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  #21  
Old 09-17-2014, 02:11 AM
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Originally Posted by ard View Post
The issue with damage to a diff is TIME and SPEED. Effectively mismatched tires will heat the diff and diff fluid. On turns you simply CANNOT geenrate enough continuous mismatch at speed to damage the diff. Put mismatched tires on and drive 70mph in a straight line for 2 hours and you can.
ok, this makes sense - thanks!
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  #22  
Old 09-17-2014, 02:13 AM
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Originally Posted by ard View Post
Yes, that is PRECISELY what I am saying.

Tell you what, go to tirerack, look up your car. Select tires for "OE"..look at each of the OE tires, and write down the DIAMETER of the OE 19", the OE 20" etc...all of them will be the same diameter.

Why?

BECAUSE BMW DOESNT WANT TO HAVE TO RECALIBRATE CARS AS THEY ARE BUILT, ordered with different tire/wheel combos!

So the OE donut spare will work on and OE wheel size.

And I do have and idea what BMW recommends: the OE donut spare
100%, i get it now. thanks again. (Did not realize that 18'", 19" and 20" had teh same OD)
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  #23  
Old 09-25-2014, 07:38 AM
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Originally Posted by Roadster View Post
I went to the tyre shop this morning to drop of the tyre.
They told me they are not allowed (car is a lease) to fix the puncture with the usual mushroom as the tyre is a runflat...
Reason is they can't see if the steel structure in the tyre is damaged or not... told them I pulled over immediately after hitting the nail... but they don't want to hear it. The same thing happened to me on my E61, had the tyre plugged with a mushroom, the tyre blew up about 3 months later, so maybe they're not wrong... Anyways, by Monday I should have a new tyre installed.
not my problem because I have extra tyres included in my lease, but it feels like a waste to throw away a tyre that could have lasted for another 10k kms...
In the States the tire will be recycle, probably into children playground cover.
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  #24  
Old 09-25-2014, 02:24 PM
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Originally Posted by upallnight View Post
In the States the tire will be recycle, probably sold for $5 to somebody who will patch it and sell it on ebay for $30
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