Class Schedule

• SP・NSF100SP

  Mixed class with modified vehicles with 50cc 2-stroke engines and wheel diameters of 12-17 inches, and HRC-made 4-stroke mini bike racer "NSF100".

• NSF100 HRC Trophy

  One-make class with HRC-made 4-stroke mini bike racer "NSF100"

• HRC GROM Cup Advance Class

  One-make class with HRC's competition-only production racer "HRC GROM"
  Tires are DUNLOP one-make
  Advance class is an advanced class for riders who exceed the standard lap time of 49 seconds.

• HRC GROM Cup Rookie Class

  One-make class with HRC-manufactured competition-only production racer "HRC GROM"
  Tires are DUNLOP one-make
  Rookie class is an introductory class for riders who have a standard lap time of less than 49 seconds

• Challenge Expert

  Challenge class with a designated lap time that exceeds 48 seconds
  Class for vehicles with 50cc 2-stroke or 100cc 4-stroke engines with a mission
  If the engine can be installed without any modifications to the frame or stays, the combination of frame and engine is not restricted.

• Challenge 48

  Challenge class with a set lap time of 48 seconds
  Class for vehicles with 50cc 2-stroke or 100cc 4-stroke engines with a mission
  If the engine can be installed without any modifications to the frame, such as brackets, then the combination of frame and engine is not restricted.

• Challenge 50

  Challenge class with a designated lap time of 50 seconds
  Class for vehicles with 50cc 2-stroke or 100cc 4-stroke engines with a mission
  If the engine can be installed without any modifications to the frame or stays, the combination of frame and engine is not restricted.

• Challenge 52

  Challenge class with a set lap time of 52 seconds
  Class for vehicles with 50cc 2-stroke or 100cc 4-stroke engines with a mission
  No modifications to the frame or stays are allowed for the engine to be installed, as long as it is an unmodified engine that can be installed on the frame at the time of manufacturer's shipment.

• 48 Hours Endurance

  90-minute endurance class with a designated lap time of 48 seconds.
  Vehicle regulations are the same as the Challenge Class, with registration open for up to three riders.

• 49 Hours Endurance

  90-minute endurance class with a designated lap time of 49 seconds
  Vehicle regulations are the same as the Challenge Class, with registration available for up to three riders

• GROM Cup Endurance

  90-minute endurance class with HRC-manufactured competition-use commercial racer "HRC GROM"
  Vehicle regulations are the same as HRC GROM Cup, with registration possible for up to 3 riders

• TAN (Solo Endurance)

  Registration for only one rider in the 90-minute endurance class.
  Vehicle regulations are the same as the Challenge Class, with two mandatory pit stops of 15 minutes each.