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      11-12-2012, 01:46 PM   #3
chrisny
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Drives: Msport '13 335xi & '14 X5 35i
Join Date: Apr 2012
Location: NY

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Warning comes on way before half and any normal loss should more or less apply to all tires and not be so drastic. Sudden temperature changes can have a big impact, but again, not just to one tire.. Not sure I would worry about replacing both tires to keep wear the same, but I guess that depends on how low the tread is on the one that is still good.