Dick's Tip #16: NASCAR Tire Tread Design

Motor Whirled host Dick Casper discusses design details of NASCAR tires. Enter to win a 2007 Dodge Charger SRT8 at www.wrigleysracing.com. (No purch. necessary. Enter by 10/1/07. Must be legal resident of the 50 U.S. & D.C., ages 18 . Void where pro