The following are known Game Genie Codes for Road Rash on SEGA Game Gear.

• Don’t Lose Speed On Grass
  00A C6C E62
• Always Travel At Max Speed
  3EA C3C 08A
  FFA C4C E62
  Note: You still need to press 1 to start moving.
• Start With Very Little Bike Energy
  058 49C 916
• Start With Mega Bike Energy
  FF8 49C 916
• Infinite Bike Energy
  213 054 91D
• Biker Information Disappears
  001 24A A2C
• Infinite Time
  00D B5E E6E
• Inflict More Damage When You Punch Other Bikers
  3EE 9A5 4CA
  00E 9B5 F7A