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 Since 2017 the GNC1 class has been replaced by the new AFT Twins class, featuring twin-cylinder motorcycles at all events.[1]

GNC1 Twins

Eligible engines

As of May 20, 2016[2]

Engine displacement

550-1250cc with the following restrictions: racing-only engines (Harley-Davidson XR750, Honda RS750, and Indian Motorcycle Race 750) may not exceed 750cc, engines greater than 1000cc are restricted to air/oil cooled.

Minimum weight

300 pounds (136 kg) including fuel.

Tires

Dunlop DT3 19-inch flat track tires.[3]

Fuel

Sunoco Supreme 112

GNC1 Singles

Eligible motorcycles

  • Honda CRF450R
  • Husqvarna FC450
  • Kawasaki KX450F
  • KTM 450 SX-F
  • KTM 450 XC
  • Suzuki RM-Z 450
  • Yamaha YZ450F
  • Zaeta 450DT

Engine displacement

Minimum weight

Tires

Dunlop DT3 19-inch flat track tires.[4]

Fuel

Sunoco Supreme 112

References

  1. ↑ "Archived copy" (PDF). Archived from the original (PDF) on 2016-08-16. Retrieved 2016-06-02.{{cite web}}: CS1 maint: archived copy as title (link)
  2. ↑ http://amaproracing.com/storage/app/uploads/public/573/f5a/763/573f5a76362fc176743707.pdf
  3. ↑ "Common Tread Blog".
  4. ↑ "Common Tread Blog".
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