GNC1


GNC1 was the premier class in the 2015-16 AMA Grand National Championship for professional motorcycle flat track racing in the United States.
The GNC1 class debuted in the 2015 season, replacing the previous Expert division and combining both singles and twins events in a unified championship.
In GNC1, twin-cylinder motorcycles were the primary machines and were used for Mile and Half-Mile circuits while single-cylinder motorcycles were used for Short Track and TT events. Since 2017 the GNC1 class has been replaced by the new AFT Twins class, featuring twin-cylinder motorcycles at all events.

GNC1 Twins

Eligible engines

As of May 20, 2016
550-1250cc with the following restrictions: racing-only engines may not exceed 750cc, engines greater than 1000cc are restricted to air/oil cooled.

Minimum weight

300 pounds including fuel.

Tires

Dunlop DT3 19-inch flat track tires.

Fuel

Sunoco Supreme 112

GNC1 Singles

Eligible motorcycles

Minimum weight

Tires

Dunlop DT3 19-inch flat track tires.

Fuel

Sunoco Supreme 112