Technical Bulletins

TIRE BULLETIN: USAC SILVER CROWN NATIONAL CHAMPIONSHIP

October 1, 2024

210 - TIRES

E. DIRT EVENTS ONLY: The same right rear tire that is used in qualifications must be used to start the main event. If the right rear tire is changed before the start of the main event the car must start at the back of the field with a one (1) lap penalty.

F. PAVEMENT EVENTS ONLY: The same right rear and right front tires that are used in qualifications must be used to start the main event. If the right rear or right front tire is changed before the start of the main event the car must start at the back of the field with a one (1) lap penalty.

Through the End of the 2023 Season: Both new & old Hoosier medium right rear tires are permitted.

Through the End of the 2023 Season: Any Hoosier left rear tire is permitted (including SC12, RD Series & D Series).

‍

Through May 15: Both new and old Hoosier Medium Right Rear tires are permitted.

After May 15:  Only new Hoosier Medium Right Rear tires are permitted.

Through June 30: Any Hoosier Left Rear tire is permitted.

Starting July 1: Only Hoosier SC12 Left Rear tire is permitted.

An amendment has been made to all three USAC National series:

Under Section 207, 307, and 407, titanium suspension parts to include torsion stops and torsion arms are permitted.

Through June 30: Both new & old Hoosier Medium right rear tires are permitted.

Through June 30: Any Hoosier left rear tire is permitted.

Starting July 1: Only new Hoosier Medium right rear tires are permitted.

Starting July 1: Only Hoosier SC12 left rear tire is permitted.

Through July 31: Both new & old Hoosier Medium right rear tires are permitted.

Through July 31: Any Hoosier left rear tire is permitted.

Starting August 1: Only new Hoosier Medium right rear tires are permitted.

Starting August 1: Only Hoosier SC12 left rear tire is permitted.

Update to Appendix D, Section 416.C – Ignition & Electronic Equipment

The Performance Electronics PE3 IG and IG2 ignition box is now permitted in USAC NOS Energy Drink Midget National Championship competition.

‍