ML4 Tread Code
ML
Service category — which machineMining and logging
Mining and logging trucks in intermittent highway service — off the road to the pit and back on it to the mill, which is why this is a truck-bus code and not an off-the-road one.
4
Tread type and depthRock Deep Tread
Cut-resistant duty on rock, with the extra rubber of a deep tread.
TKPH
What the code does not tell youNothing about load, or heat
A tread code says which machine and how much rubber. What the tyre can carry comes from its star rating, and whether it survives the haul comes from TKPH — the load and speed it can work at without overheating. A deep tread on a long, fast cycle is a tyre being cooked.
Standardised by ETRTO or TRA.