ECE regulations
Unofficial summary of ECE regulations
10 July 2013
ECE R117.02 Supplement 4
R117.02 Tyres, rolling resistance, rolling noise and wet grip
http://www.unece.org/fileadmin/DAM/trans/doc/2013/wp29/ECE-TRANS-WP29-2013-055e.pdf
http://www.unece.org/fileadmin/DAM/trans/doc/2013/wp29/ECE-TRANS-WP29-2013-059e.pdf
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