Division 2.14 F1 Original text. Later amendments are not shown. ‘ Tread groove ’ means the space between the adjacent ribs or blocks in the tread pattern. Annotations Textual amendments F1 Substituted by Council Decision of 13 March 2006 amending Decisions 2001/507/EC and 2001/509/EC with a view to making United Nations Economic Commission for Europe (UN/ECE) Regulation Nos 109 and 108 on retreaded tyres compulsory (2006/443/EC). ← Division 2.13 Division 2.14 Division 2.15 →