C2 Tread Code
C
Service category — which machineCompactor
Rollers and compactors, where the tyre is part of how the ground gets compressed.
2
Tread type and depthGrooved Tread
A shallow grooved pattern, enough to shed water and give some bite without giving up much rubber.
ETRTO
The same code under the other standardGrooved Tread
ETRTO Standards Manual 2026 lists C-2 as a grooved tread. Using these codes at all is left to the individual tyre maker, so a tyre may be marked to ETRTO, to TRA, or to neither.
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.