USATODAY.com Feed: Tires remain concern at Michigan; Ambrose breaks pole record

USATODAY.com Feed http://www.usatoday.com

Tires remain concern at Michigan; Ambrose breaks pole record Jun 16th 2012, 20:33 With treads falling apart after 15 laps and speeds approaching 220 mph, NASCAR made a last-minute switch to a new left-side tire.

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