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'''GNC1''' was the premier class in the 2015-16 [[AMA Grand National Championship]] for professional motorcycle [[track racing|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 Since 2017 the GNC1 class has been replaced by the new ''AFT Twins'' class, featuring twin-cylinder motorcycles at all events.<ref>{{Cite web |url=http://amaproracing.cdn.racersites.com/assets/AMAP-2016-FT-Rulebook-Redline-Rules.pdf |title=Archived copy |access-date=2016-06-02 |archive-date=2016-08-16 |archive-url=https://web.archive.org/web/20160816032021/http://amaproracing.cdn.racersites.com/assets/AMAP-2016-FT-Rulebook-Redline-Rules.pdf |url-status=dead }}</ref>
==GNC1 Twins==
===Eligible engines===
As of May 20, 2016<ref>http://amaproracing.com/storage/app/uploads/public/573/f5a/763/573f5a76362fc176743707.pdf {{Bare URL PDF|date=March 2022}}</ref>
*[[Aprilia]]
**[[Aprilia RSV 1000 R|RSV 1000 R]]
**[[RXV 550]] / [[SXV 550]]
*[[BMW F series parallel-twin|BMW F800]]
*[[Buell Motorcycle Company]]
**XB9
**XB12
**XB3
*[[Ducati]]
**Desmodue 803
**Desmodue Evo 1100
**Desmoquattro 748
**Testastretta 749, 821, 848, 939
*Harley-Davidson
**[[Harley-Davidson XR-750|XR-750]] (race-only engine)
**XG750
**883
**XR1200
*Honda
**NC700X
**RS750 (race-only engine)
*[[Indian Motocycle Manufacturing Company|Indian]]
**[[Indian Scout FTR750|Scout FTR750]] (race-only engine)
**Scout 60
*Kawasaki
**Ninja 650R
*KTM
**LC8
*Suzuki
**[[Suzuki SV650|SV650]]
**[[Suzuki SV1000|SV1000]]
**[[Suzuki TL1000R|TL1000]]
*Triumph
**Bonneville 865 (air-cooled)
**Bonneville 900 (liquid-cooled)
*Yamaha
**[[Yamaha TDM850|TDM]]
**[[Yamaha MT-07|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&nbsp;kg) including fuel.
===Tires===
Dunlop DT3 19-inch flat track tires.<ref>{{Cite web|url=http://www.motorcycle-usa.com/2016/02/article/ama-pro-flat-track-releases-full-2016-rule-book/|title = Common Tread Blog}}</ref>
===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.<ref>{{Cite web|url=http://www.motorcycle-usa.com/2016/02/article/ama-pro-flat-track-releases-full-2016-rule-book/|title = Common Tread Blog}}</ref>
===Fuel===
Sunoco Supreme 112
==References==
{{Reflist}}
[[Category:Motorcycle racing by type]]