This group was authorized in 2019 to consider the performance of tyres after initial use. The broad concern is to ensure that somewhat worn tyres continue to comply with the requirements for new tyre approvals (i.e., no serious degradation in performance after initial use and before such wear as would require tyre replacement).
| Wet Grip on Worn Tyres: Agenda for the 72nd (February 2026) session |
| Reference Number: WT-72-01/Rev.1 |
| Meeting Sessions: 72nd WT session (3 Feb) |
| Document date: 02 Feb 26 |
| Relevant to: UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance |
| Click here to view the full document file |
| Worn tyres: Post-processing task force status report |
| Reference Number: WT-72-02 |
| Meeting Sessions: 72nd WT session (3 Feb) |
| Document date: 02 Feb 26 |
| Relevant to: UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance |
| Click here to view the full document file |
| Wet Grip on Worn Tyres: Minutes of the 72nd (February 2026) session |
| Reference Number: WT-72-04 |
|
The secretary reported on C1 tyre testing activities. The Netherlands and Germany noted potential delays in Normal tyre testing at high temperature by end of March due to temperature conditions. The co-chair presented a status report for GRBP’s 83rd session, which the group approved. Future meetings are scheduled for February through April. |
| Meeting Sessions: 72nd WT session (3 Feb) |
| Document date: 03 Feb 26 |
| Relevant to: UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance |
| Click here to view the full document file |
| Participants list from the 72nd Worn Tyres informal group session |
| Reference Number: WT-72-06 |
| Meeting Sessions: 72nd WT session (3 Feb) |
| Document date: 03 Feb 26 |
| Click here to view the full document file |
| Wet Grip on Worn Tyres: Agenda for the 73rd (March 2026) session |
| Reference Number: WT-73-01 |
| Meeting Sessions: 73rd WT session (31 Mar) |
| Document date: 27 Mar 26 |
| Relevant to: UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance |
| Click here to view the full document file |
| Wet grip on worn tyres: Post-processing task force (WTPP) status report |
| Reference Number: WT-73-02 |
| Meeting Sessions: 73rd WT session (31 Mar) |
| Document date: 31 Mar 26 |
| Relevant to: UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance |
| Click here to view the full document file |