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: 276mmI.D: 175mmMinimum Thickness: 4.5mmDisc Position: Rear Fits: BMW R1100GS 1993-1999 R1100R 1993-2001 R1100RT 1994-2001 R1100S 1998-2005 R1150GS 1998-2006 R1150GS ADVENTURE 2001-2005 R1150R 2001-2006 R1150R ROCKSTER 2002 R1150R Rockster 2003-2005 R1150RS 2000-2006 R1150RT 2000-2006 R850GS 1994-2007 R850R 1995-2007 R850RT 1998-2007