(1)  If the engine power of a motor bike is transmitted to the rear wheel by a chain, the driver and any passenger must be protected from the front sprocket and at least the upper part of the chain by –

(a) the frame or equipment of the motor bike; or

(b) a chain guard.

(2)  A chain guard must cover the chain to a point –

(a) at least 300 millimetres to the rear of the rearmost foot rest; or

(b) above the centre of the rear drive sprocket.