Hong Kong Regulations

ROAD TRAFFIC (CONSTRUCTION AND MAINTENANCE OF VEHICLES) REGULATIONS - REGULATION 21

Tyre of soft or elastic material

A tyre shall not be deemed to be of soft or elastic material unless the said
material is either-

   (a)  continuous round the circumference of the wheel; or

   (b)  fitted in sections so that so far as reasonably practicable no space
        is left between the ends thereof, and is of such thickness and design
        as to minimize, so far as reasonably possible, vibration when the
        vehicle is in motion, and so constructed as to be free from any defect
        which might in any way cause damage to the surface of a road.