The evolution of our Evolve XC crank - now featuring our X-Type external bottom bracket system
· Manufactured from 6066-T6 aluminum, this material is over 30% stronger than 6061
· Evolve chainrings are built from 7050 aluminum for increased stiffness and impact strength
· Evolve chainrings feature our patented S.H.I.F.T technology for lighting quick up-shifts
· Lightweight CrMo spindle