*These rules are also in effect for AMSOIL USAC/CRA, USAC West Coast, and Sands Chevrolet USAC SouthWest Sprint Cars for 2018.
USAC TECHNICAL UPDATE – TB2018-NAT001
Date: JANUARY 1, 2018
ALL NATIONAL SERIES
-Digital bleeders are allowed. Air may not be introduced to the tire. Bleeders may not be controlled remotely.
-Full containment seats mandatory beginning May 1, 2018. Beginning in 2019 all seats must meet SFI 39.2 specifications.
Silver Crown Series
-Tire options for events in 2018 remain the same as 2017
-Suspension adjustments by the driver from the cockpit will not be permitted.
-Front axle tethers will be mandatory beginning May 1, 2018.
-Hoosier will make 94/14.0 available in RD12 compound