About the AMA Pro Flat Track GNC1 Championship

GNC1 Twins (Mile and Half-mile)

  • Top Speed: Over 130 mph
  • Engine Displacement: 550cc - 1250cc with the following restrictions, racing only engines may not exceed 750cc, engines greater than 1000cc are restricted to air/oil cooled.
  • Eligible Bikes: Aprilia RSV 1000/550, BMW FS 800, Buell CR1125/XBR/1200, Ducati 748/848, Harley-Davidson XR 750/XR1200/883, Harley-Davidson Street 750, Honda RS 750, Kawasaki 650 Ninja, KTM 990 Super Duke, Suzuki TL 1000/SV 650/680/750, Triumph Bonneville Scrambler/America/Speedmaster, Yamaha Tenure 750 and Yamaha FZ07.
  • Minimum Weight: 310 lbs with fuel.
  • Fuel: Sunoco Supreme 112
  • Tires: Goodyear/Dunlop, 19-inch, purpose-built flat track tires

The twin-cylinder motorcycles contested in GNC1 are the most powerful machines in the Grand National Championship. Reaching speeds in excess of 130 mph, the large-displacement motorcycles are based on rules which allow for a variety of performance modifications.

All machines run on purpose-built Goodyear or Dunlop tires and are fueled by Sunoco Supreme 112 race fuel.

As impressive as the motorcycles are, it’s the all-star lineup of riders that truly puts on the show. Jared Mees rebounded in 2014 to recover the coveted National No. 1 plate, which he had forfeited to Brad Baker in 2013. Mees did most of his damage aboard a twin, specifically his Rogers Racing HarleyDavidson, on which he recorded eight podiums.

GNC1 - Singles Races (Short Track and TTs)

  • Horsepower: 60+ horsepower
  • Minimum Weights: No minimum weight limit.
  • Top Speed: Over 115 MPH
  • 0-60 mph: Under 4 seconds
  • Tires: Goodyear/Dunlop 19-inch, purpose-built flat track tires
  • Fuel: Sunoco Supreme 112
  • Race Lengths: 25-lap sprints
  • Engine Displacement: 251cc to 450cc 4-stroke with the following restrictions: all single-cylinder engine displacements are absolute, with no overbore allowances, single-cylinder engines must maintain stock bore and stroke.
  • Eligible machines: Honda CRF450R, Kawasaki KX 450F, KTM 350 SX-F, KTM 450 SX-F, KTM 450 SX-F FE, KTM 450 SX, Suzuki RMZ 450 and Yamaha YZ450F.

When competing on short tracks and TTs, the stars of AMA Pro GNC1 have to switch gears to their singlecylinder, production-based 450cc bikes. Putting the emphasis on more strategic and intricate racing methods, the shorter courses contain less lengthy straightaways and demand a high level of creativity in order to get to the front of the pack and maintain a competitive position.

In 2014, there were four GNC1 Singles races. The DAYTONA Flat Track doubleheader saw Briar Bauman and Kenny Coolbeth, Jr. earn victories aboard their Honda CRF450Rs. At the Castle Rock TT and Peoria TT, Henry Wiles took home the checkered flags with a couple of convincing wins aboard his Kawasaki KX450F.

  • Dunlop
  • Harley-Davidson
  • KYMCO
  • MotoBatt
  • Saddlemen
  • Sunoco
  • Thom Duma Fine Jewelers