The Verizon IndyCar Series, Firestone and ISM Raceway will start the process of rubbering in a high line at the one-mile Phoenix oval on Wednesday. The process, which involves towing the Firestone tires around the circuit with a special sled that compresses the rubber into the track surface while slowly rotating the tires to avoid flat spots and punctures, could add enough grip to the outer lane for drivers to venture out in practice and see if the single-lane circuit has been expanded to two. Related Stories Related Stories IndyCar Tracy, Mario found different fortunes in 1993 Phoenix race PODCAST: The Week in IndyCar, April 4, with Paul Tracy IndyCar's Phoenix race kicks off NBCSN...
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