The SwissStop Catalyst Pro Disc Rotor is the most lightweight rotor option from SwissStop. The two-piece rotor does not sacrifice performance, and features a spider design that offers improved aerodynamics.Features-12% lighter than Catalyst Pro-Two-piece construction-Brake ring dimensions are optimized for race pads-1.8 mm thickness-Aluminum alloy spider provides increased stiffness-New spider design for improved aerodynamics-Centerlock mount-Compatible with all sintered and organic pad compounds-Optimized for SwissStop EXOTherm2 and Disc RS-UCI approvedItem Specifications-Rotor Size (mm):140-Hub/Disc Compatibility:Center-Lock Disc-Pad Compatibility:All Pad Compounds-Rotor Type:Two Piece