| Supplement 13 to UN R117 |
| Reference Number: WT-21-03/Rev.1 |
| Document date: 21 May 21 |
| Relevant to UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance. |
| View full document file for more information |
| WT-21-03/Rev.1 |