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: 310mmI.D: 144mmMinimum Thickness: 4.5mmDisc Position: Front Left or Right Fits: Triumph AMERICA 2002-2009 BONNEVILLE 2000-2005 BONNEVILLE T100 2002-2005 SPEEDMASTER 800 2003-2005 SPEEDMASTER 865 2006-2009 TIGER 900 1993-1998 TIGER 955 1999-2004