Miche syntium hsp 11sp road double chainsetthis stunning chainset is specifically designed for use with your 11 speed road drivetrain. Additionally, this superb model uses a 4 arm spider design for crisp, clean looks but with the added stiffness of its hsp system, making it stronger than a 5 arm chainring. Finally, its hsp system strengthens the chainrings by using the spider to support them on both sides, without the need for spacers. This is a perfect replacement or upgrade for pushing your road performance to the max.features arm material forged cnc machined aluminium ring material cnc machined al 7075 t6 aluminium high stiffness point system speed 11 speed use road weight 798g 170mm versionbuy miche components from chain reaction cycles, the world's largest online bike store.