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: 164mmMinimum Thickness: 3.5mmDisc Position: Front Left or Right Fits: BMW K100 1983-1990 K100LT 1986-1991 K100RS 1983-1988 K100RT 1983-1989 K75 1983-1996 K75S 1983-1996