MTX Performance Brake Disc Rear Solid Round Harley Davidson MD512 #11006MDS11006 MTX Performance Brake Disc (Rear Solid Disc) [HARLEY DAVIDSON Touring 13401984 1999] Drawing from its immense racing experience, MTX has refined the performance and tolerances now offering applications for almost every motorcycle brand and model on the market. Performance at your fingertips. Discs sold singularly. Solid discs Constructed using one complete segment of Japanese SUS 420 stainless steel, then heat treated to HRC 36+ 2 standards.