Gearbox Classes
On short circuits, drivers in gearbox classes must be over 16. On long circuits, drivers must no longer be novices. In the 125 and 210 classes they must also be over 16 and in the 250 classes, over 17.
125 ICC ( UK)
Age: 16+
Minimum kart + driver weight: 180kg
Engine: 125cc reed valve engines with 30mm carburettor
125 Open
Age: 16+
Minimum kart + driver weight: 185kg on long circuit
Engine: 125cc reed or rotary valve engines
250 National
Age: 16+ (17+ for long circuit)
Minimum kart + driver weight: 195kg on short circuit and 200kg on long circuit
Engine: 250cc single-cylinder engines with 5 speed gearbox
