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: 220mmI.D: 86mmMinimum Thickness: 2.5mmDisc Position: Front Left or Right Fits: Yamaha TT225R 2002-2005 TT250R 1993-1997 TTR225 1999-2001 TTR230 2005-2021 TW200 2001-2012 TW200 TRAILWAY 2013-2014 XT250 1995-2007 YZ125 1985-1987 YZ250 1986-1987 YZ490 1986-1987