INDYCAR has updated Section 14.14 (Tires) of the 2013 IZOD IndyCar Series rulebook, effective with the Toyota Grand Prix of Long Beach, to include:

• Changing tires on the pre-race grid is not permitted without INDYCAR approval (14.14.1.1).

• Entrants completing five or more laps during practice 1 (Group B) on road and street circuits will earn an additional set of primary tires. These laps may consist of any combination of “in” and/or “out” laps (14.14.6.7.2).

The update to Rule 14.14.6.7.2 is intended to allow all entrants to participate for longer periods in the initial practice session on road and street circuits. There is no mandate on which set of tires entrants must use for the five laps. Rookies and entrants outside of the top 10 in the standings still must return their additional set of tires, regardless of use, after the completion of Session 1.

Firestone Racing tire allotments are a maximum of four sets of primary and three sets of alternates for single races on road and street circuits. Eight sets of primary and three sets of alternate tires will be allotted to each entrant for the doubleheaders at Detroit, Toronto and Houston.

The Firestone primary and alternate tire specifications for Long Beach are the same as used in last month's season opener at St. Petersburg, Fla., as Firestone Racing was successful in its goal to increase the performance gap between the tire specs.