MTX solid discs are constructed using one complete segment of Japanese SUS 420 stainless steel then heat-treated to HRC 36+-2. Lightening and drill hole patterns are as per OEM designs to improve braking performance and reduce the temperature of the disc.MTX Discs provide amazing braking control for your motorcycle. All MTX discs are designed and manufactured with world-leading cutting edge technologies:Precision CNC machined and laser-cut technologyJapanese SUS 420 Stainless SteelReplacement for Original EquipmentOEM Design; lightening & drill hole patternsSpecifications:O.D: 285mmI.D: 144mmMinimum Thickness: 5.5mmDisc Position: Rear Fits: Triumph ADVENTURER 900 1995-2001 AMERICA 2002-2018 AMERICA LT 2015-2017 LEGEND TT 1998-2001 SPEEDMASTER 800 2003-2005 SPEEDMASTER 865 2006-2017 TIGER 955 1999-2004