Sram pc1091 10 speed hollow pin chainthe newest 1091 chain features more heavily chamfered outer plates for improved shifting and quieter running other advancements include a new inner plate finish plus chrome hardened pin construction both for longer chain life the hollowpin construction of srams 10 speed powerchain provides smooth precise shifting and weight savings without sacrificing strength technology hollowpin we employ hollowpin construction on all sram top of the line powerchai