Shimano RT-EM910 Ice Tech Freeza Centerlock Brake Disc (inner nut)

ICE TECHNOLOGIES FREEZA brake discs are designed to maximize brake cooling, resulting in consistent braking and increased pad life.The rotor is designed in 3 layers, therefore a central structure in aluminum, and external tracks in steel, this construction making it possible to dissipate heat by means of fins in the center.Details:Ice Tech Freeza technology.centerlock nut (internal tightening)Weight: 180mm (144g) and 203mm (116g)Reference: IRTM910