SPINTRACTIEMETHODE VOOR BANDEN VAN DE KLASSEN C1 EN C2 ###>SPIN TRACTION METHOD FOR CLASS C1 AND C2 TYRES The test procedure of ASTM standard F1805-06 shall be used to assess snow performance through spin traction values on medium packed snow (The snow compaction index measured with a CTI penetrometer [1] shall be between 70 and 80).