TRA Tyre Codes Explained
The TRA system, developed by the Tire and Rim Association (TRA), classifies off-the-road tyres based on application and tread depth.
How TRA Codes Work
Each code consists of a letter (application) and a number (tread depth/ severity).
TRA Codes Table
| TRA Code | Description |
|---|---|
| RM | Radial Mining / Earthmover Tyre |
| TL | Tubeless Tyre |
| TT | Tube Type Tyre |
| B | Bias / Cross Ply Tyre |
| E | Earthmover / Off-The-Road Tyre |
| G | Grader Tyre |
| L | Loader Tyre |
| R | Radial Tyre |
| S | Skid Steer / Small Industrial Tyre |
| VLTS | Very Large Tyre Size / Earthmover |
| E4 | Pattern designation for OTR/ Earthmover |
| 2HL | Load & Ply Rating (example: 2 High Load) |
Tread Depth Meaning
| Depth Code | Meaning |
|---|---|
| 2 | Traction – Soft ground |
| 3 | Standard – General use |
| 4 | Deep – Longer wear |
| 5 | Extra deep – Severe conditions |
Key Trade-Off
Deeper tread provides longer life but generates more heat. Selection depends on haul distance, load and terrain.
TyreFinder Insight
TRA codes are critical for correct tyre selection, performance optimization and reducing total operating costs.