The TRP R1 2.3mm 1-piece 6-bolt thick rotor is designed specifically for DHR and E-MTB brakes only. - For DHR and E-MTB only - 2.3mm thickness provides 47% increased torsional stiffness and 8% better cooling capacity - Design reduces vibrations and increases stiffness and power - Rotor wear indicators - Includes 6 stainless steel bolts - Features a clear "Rust Blocker" treatment on arms to help prevent corrosion