INDYCAR will introduce alternate-compound Firestone Firehawk tires for the NTT INDYCAR SERIES season finale, the Big Machine Music City Grand Prix on September 15 at Nashville Superspeedway.

Used in addition to Firestone Firehawk primary compounds, the softer alternate red-sidewall tires will provide another set of options, strategies and choices for drivers and teams.

In addition, rules for use of the weekend’s tire allotment also have been updated. Each entry will receive six sets of primary-compound tires and four sets of alternate-compound tires.

NTT INDYCAR SERIES teams may use their weekend allotment unrestricted in practice and NTT P1 Award qualifying. During the race, teams must use, in any order, one set of primary-compound tires and two sets of alternate-compound tires.

As on road and street circuits, cars must complete two laps on each set of required tires. Failure to comply with this rule will result in a minimum one-lap penalty.

There will be no requirements on whether the tires used in the race must be “new” or “used,” and no restrictions governing the use of new or used primary or alternate tires in NTT P1 Award qualifying.

For more information, visit indycar.com.