600 & 600 Restricted – All Tires must be Hoosier Tires. Right Rear must be RD25 or harder compound. (Phase out RD15 – 7/1/2023)

1200 – Right rear compound must be American Racer SD38 or Hoosier SP2 or harder. (Phase out SD33 – 7/1/2023)

Phased out tires will not be permitted after Midseason Championship Night on 6/30/2023.