Proposal to supersede document GRBP/2025/27 for a new UN Regulation on uniform provisions concerning the approval of tyres with regard to abrasion performance. The regulation establishes scope, definitions, application requirements, marking standards, approval procedures, and technical requirements for class C₁ tyres. It excludes temporary-use spare tyres, competition tyres, ice grip tyres, studded tyres, and certain other tyre categories. Type approval is granted if candidate tyres meet abrasion performance limits measured by one of two methods: vehicle testing on public open roads or indoor drum testing. Abrasion index limits are defined for normal, snow, and special use tyres, with adjustments for specific tyre groups. Requirements include conformity of production verification, penalties for non-conformity, and transitional provisions establishing Stage 1 and Stage 2 implementation timelines with specified dates for mandatory approval.

Proposal to amend UN GTR No. 21 on determination of system power of hybrid electric vehicles and pure electric vehicles with more than one electric machine for propulsion. The amendment establishes reference points representing where mechanical power is first produced from energy storage systems, distinguishes between Test Procedure 1 (measuring electrical power and engine power) and Test Procedure 2 (measuring torque and speed at axles or wheel hubs), requires manufacturers to provide verifiable K factors representing conversion efficiencies, mandates five test repetitions with averaging of the last four, specifies measurement accuracies and frequencies, removes dynamometer roller measurement option for TP2 in favor of torque and speed sensors or hub dynamometer, adds system bench testing as alternative with manufacturer approval, and includes applicability guidelines determining which procedure applies to specific powertrain architectures.