G1 Tread Code
G
Service category — which machineGrader
Motor graders, which need steering bite without tearing up the surface they have just cut.
1
Tread type and depthRib Regular Tread
Circumferential ribs at standard depth. Steering positions and free-rolling axles, where a lug pattern would squirm.
ETRTO
The same code under the other standardRib Regular Tread
ETRTO Standards Manual 2026 lists G-1 as a rib regular 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.