The SRAM PC1091R 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 SRAM's 10 speed PowerChain provides smooth, precise shifting and weight savings without sacrificing strength.
I was real happy at the start but after 3000 miles of hard riding the chain stretched and shifting was not as crisp. Quit using hollowpin chain for training and just keep it for special events, use the cheaper 1051 chain, nice.