Class Schedule

• SP・NSF100SP

  Mixed class with modified vehicles with a displacement of 50cc and 2-stroke transmission and HRC-made 4-stroke mini bike racer "NSF100" with wheel diameter of 12-17 inches.

• NSF100 HRC Trophy

  One-make class featuring the 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 commercial racer "HRC GROM"
  Tires are DUNLOP one-make
  Rookie class is an introductory class for riders who fall below the standard lap time of 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 transmissions
  No modifications to the frame or stays are allowed for vehicles with unmodified engines that can be mounted without modifications to the frame or engine, regardless of the combination of frame and engine at the time of manufacturer's shipment

• Challenge 48

  Challenge class with a designated lap time of 48 seconds
  Class for vehicles with 50cc 2-stroke or 100cc 4-stroke engines with transmission
  No restrictions on frame and engine combination as long as the engine can be installed without any modifications to the frame or stays at the time of manufacturer's shipment

• 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 designated lap time of 52 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.

• 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 allowed for up to 3 riders

• GROM Cup Endurance

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

• TAN (Solo Endurance)

  90-minute endurance class for registered riders only
  Vehicle regulations are the same as the Challenge Class, with two mandatory pit stops of 15 minutes each