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Old 03-10-2011, 07:51 PM   #2
Kubica
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Join Date: Apr 2008
Location: Boston
Posts: 4,473
My Ride: 2003 325xi
1/4" of tread = 8/32" of tread. The tires when new probably had 10/32" tread. A 2/32" tread difference front/rear is ok. That said, do you really have 8/32" tread on your two best tires? You need a tire tread depth gauge to accurately measure tread depth. Eye-balling it or using a quarter really isn't going to cut it here.

Is the spare tire the same brand/size as the michelins? I bet if you remounted it on the rim it would hold air.

You can always look for a used tire if you can't afford a new pair/set.
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