Steering Gear

6.12.1 Motorcycle You may not use a motorcycle on a public road-unless all parts of the steering gear are maintained in a condition, which enables the motorcycle to be steered safely and efficiently; unless the distance between the outside edges of the handlebars is (i) between 600 and 800 millimetres in respect of motorcycles having an engine with a cylinder capacity of 200 cubic centimetres more

Source: Rules manual §6.12