National Transport Commission (Road Transport Legislation – Vehicle Standards) Regulations 2006
54Tyre tread
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54 Tyre tread
(1) A tyre on a motor vehicle must not have cleats or other gripping devices that could damage road surfaces. (2) Except at tread wear indicators, a tyre fitted to the vehicle must have a tread pattern at least 1.5 millimetres deep in a band that runs continuously: (a) across: (i) for a vehicle with a GVM over 4.5 tonnes—at least 75% of the tyre width that normally comes into contact with the road; or (ii) for another vehicle—the tyre width that normally comes into contact with the road; and (b) around the whole circumference of the tyre. (3) A vehicle must not be fitted with a tyre that has been treated by recutting or regrooving the tread rubber, unless the tyre was: (a) constructed with an extra thickness of rubber designed for recutting or regrooving; and (b) labelled to indicate the construction.