A1
- Two-wheeled, without a sidecar
- Internal combustion engine capacity not exceeding 125 cm³
- Maximum power 11 kW
- Power-to-weight ratio not exceeding 0.1 kW/kg
A2
- Two-wheeled, without a sidecar
- Internal combustion engine capacity over 125 cm³
- Power over 11 kW but not exceeding 35 kW
- Power-to-weight ratio over 0.1 kW/kg but not exceeding 0.2 kW/kg
- Not modified from a vehicle with a power output exceeding 70 kW
A
- Two-wheeled, without a sidecar
- Power over 35 kW