| Wet Grip on Worn Tyres: Report of the 73rd (March 2026) session |
| Reference Number: WT-73-03 |
|
The 73rd session of the Informal Working Group on Wet Grip of Worn Tyres convened remotely on 31 March 2026. The agenda and previous session minutes from 3 February 2026 were adopted. The WTPP secretary reported on testing activities status for the workplan stage 1 for C1 tyres, with results to be presented to GRBP at its 84th session in September 2026. ETRTO stated conclusions can only be made on complete datasets. Future meetings are scheduled through July 2026. |
| Meeting Sessions: 73rd WT session (31 Mar) |
| Document date: 19 May 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 73rd Worn Tyres informal group session |
| Reference Number: WT-73-04 |
| Meeting Sessions: 73rd WT session (31 Mar) |
| Document date: 19 May 26 |
| Click here to view the full document file |
| Worn tyres post-processing task force status update |
| Reference Number: WT-74-02 |
|
The Worn Tyres Post-Processing task force held its 34th session on 13 May 2026. Ninety-three percent of 3PMSF tests have been completed and members agreed to start the post-processing activity for the 3PMSF cluster. Test results for Normal tyres will be delivered once the high temperature range will be achieved. Future sessions are scheduled for 28 May, 15 June, 2 July, and 15 July 2026. |
| Meeting Sessions: 74th WT session (19 May) |
| Document date: 18 May 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: Agenda for the 74th (May 2026) session |
| Reference Number: WT-74-01 |
|
The agenda for the 74th session of the Informal Working Group on Wet Grip of Worn Tyres scheduled for May 19th, 2026, remotely via Teams. The agenda includes welcome and opening remarks, adoption of the agenda and minutes of the previous 73rd session meeting held 31 March 2026, discussion of the workplan 2025 for C1 tyres status test campaign, and determination of the next meeting date. |
| Meeting Sessions: 74th WT session (19 May) |
| Document date: 12 May 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 |
| 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: 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 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 |