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 Since 2017 the GNC1 class has been replaced by the new AFT Twins class, featuring twin-cylinder motorcycles at all events.^[1]

GNC1 Twins

Eligible engines

As of May 20, 2016^[2]

Aprilia
- RSV 1000 R
- RXV 550 / SXV 550
BMW F800
Buell Motorcycle Company
- XB9
- XB12
- XB3
Ducati
- Desmodue 803
- Desmodue Evo 1100
- Desmoquattro 748
- Testastretta 749, 821, 848, 939
Harley-Davidson
- XR-750 (race-only engine)
- XG750
- 883
- XR1200
Honda
- NC700X
- RS750 (race-only engine)
Indian
- Scout FTR750 (race-only engine)
- Scout 60
Kawasaki
- Ninja 650R
KTM
- LC8
Suzuki
- SV650
- SV1000
- TL1000
Triumph
- Bonneville 865 (air-cooled)
- Bonneville 900 (liquid-cooled)
Yamaha
- TDM
- FZ-07

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

^ "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)
^ http://amaproracing.com/storage/app/uploads/public/573/f5a/763/573f5a76362fc176743707.pdf ^{[bare URL PDF]}
^ "Common Tread Blog". Archived from the original on 2016-07-01. Retrieved 2016-06-02.
^ "Common Tread Blog". Archived from the original on 2016-07-01. Retrieved 2016-06-02.

[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] ttp://amaproracing.com/storage/app/uploads/public/573/f5a/763/573f5a76362fc176743707.pdf ^{[bare URL PDF]}

[3] "Common Tread Blog". Archived from the original on 2016-07-01. Retrieved 2016-06-02.

[4] "Common Tread Blog". Archived from the original on 2016-07-01. Retrieved 2016-06-02.

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