1-piece unidirectional and multidirectional carbon fiber arm/spider design with a core of structural foam and an integrated (UT) Ultra-Torque, Hirth joint semi-axle bottom bracket spindle. Enhanced Shifting Performance (EPS) Actuation System features two specialized sectors of the chainrings, an up-shift and a downshift section, for instantaneous shifting. Light alloy 11 speed chainrings with hard anodization, corrosion-proof and wear-proof treatments. Large chainring with ramps and 8 pins, plus alloy chainring and fixing bolts. Choose 34/50t (compact 110mm BCD) or 39/53t (135mm BCD). Ultra-Torque outboard bearing cupsets or integrated adaptors sold separately. Use CP-14021 for 68mm English or CP-14022 for 70mm Italian cupsets. Use CP-14985 for BB30 adaptor or CP-14987 for BB86 adaptor. 684g/690g (110mm/135mm BCD) without 49g BB cupset. .