The Catalyst Pro is the original Catalyst brake rotor that set new standards for performance and durability thanks to its two-piece construction and braking surface thickness that is optimised to suit each diameter

this tool make your job much easier

It'll fit any handlebar with a 31

you don't have to use all these spacers

and standard 22

Deity Copperhead Stem - Red - 31.8mm - 35mm x 0 Degree - 1 1-8th Inch PLP|Model Year The Catalyst Pro is theDEITY's goal with the all new Copperhead 42mm length steerer mounted stem was to design a lighter sidekick to their beloved Cavity Stem, but the results delivered a stronger, refined, and lighter super hero that they just could not break. All their designs are tested to failure, but the Copperhead refused to give up! After millions of cycles on both stress and impact testing, this stem refused to give an inch. Don't get it confused the Copperhead is