• CNC machined from 7075-T6, one of the strongest alloys available today • Outer rings are made from 4mm thick material & inner ring from 5mm thick material for unsurpassed durability • Rings feature our patented S.H.I.F.T. technology, featuring hard-wearing steel S.H.I.F.T. chips for dual action up-shifts

FSA ATB chainrings deliver flawless shifting for any mountain drivetrain. Available in alloy and steel options.