Class-leading XTR 10-speed Dyna-Sys chainset, integrating the bottom bracket and chainset into a strong, rigid, yet lightweight unitIntegrated design makes installation and adjustments easier than everPrecision bottom bracket bearings are spaced further apart, and are therefore more stable and longer lasting than conventional bottom bracketsSuper-lightweight HollowTech II forged Duralumin crank arms - hollow design saves weight whilst increasing rigidityEasy to use splined bottom bracket spindle connection provides a rigid and secure interface between crank and spindleClose ratio gear combination: 42-32-24T provides improved cadence while reducing pedal feedback on suspension bikesThe middle HG-X chainring is made of titanium supported in a carbon shell which combine to produce a hard-wearing, light weight, and stiff set upStiff, light weight and hard-wearing HG-X 7075 aluminium outer and inner chainrings with a highly durable Nickel-plate treatmentHG-X chainring with patented spike pins give smooth and fast gear shifts under load104 / 64 PCD four-arm chainringsFor use with 10-speed HG-X MTB chains onlyAverage weight 770 g (175 mm including BB)