Sram pc1091r 10 speed hollow pin chainthe hollowpin construction of srams 10 speed powerchain provides smooth precise shifting and weight savings without sacrificing strength technologieshollowpin we employ hollowpin construction on all sram top of the line powerchains hp yields plate retention strength front and rear shifting efficiency and low weight benchmarks unreachable in solid pin chain applicationspowerlock sram chain engineers developed powerlock as a tool free sure and consi