Proven on the world"s most challenging tracks, used by 2009 World Champion Steve Peat, and now it"s ready for you. This downhill-race specific crank uses the same forged AL7050 material as the freeride/DH Holzfeller, but in a second-shaving 822g Pk (that"s 240g less than the Holzfeller OCT). When your eye is on the podium, there is no room for compromise - that"s why the Descendant comes w/ the totally revamped GXP bottom bracket w/ Gutter Seal Technology. Descendant is made to order by downhill champions for winning. Chainring Middle Material AL7050, Chainring Bolts Steel, Crank Arm Material Forged 7050 Alloy, 9/10 Speed Compatible.