UN R172 change reports — Snow grip performance and traction tyre classification for retreaded tyres
UN Regulation No. 172 (ECE R172) — Uniform provisions concerning the approval of retreaded tyres with regard to their snow performance and/or classification as traction tyre.
01 series
- 01 series — Base text
A retreaded tyre can now also be classified as a “traction tyre” under new paragraph 6.2.2., by its number of traction elements and deformation potential (Pdef).
00 series
- 00 series — Supplement 2
Paragraph 6.4. now gives additional requirements for a special use tyre of class C1 to be classified as a ‘professional off-road tyre’. The tyre must have a tread depth ≥ 11 mm, a void-to-fill ratio ≥ 35 per cent and a speed category up to 160 km/h.
- 00 series — Supplement 1
As from 1 September 2030, Contracting Parties must not grant type approvals based on “snow performance tests as described in Annex 7 to UN Regulation No. 117” using SRTT19.5 or SRTT22.5 as reference tyre. The table in paragraph 6.1. now also lists SRTT19.5 siped and SRTT22.5 siped.