Promax IG-45 Alloy Sealed Integrated Tapered 1-1/8 Top 1.5" Bottom Headset Includes 1-1/8" Fork Race BLK Rear Der/Shifter Compatibility-Shimano DynaSys11 The Marathon 365 directly replacing Rate Range:500-550Lbs

Promax IG 45 Alloy Sealed Integrated Tapered 1 1 8 Top 1.5" Bottom Headset Includes 1 1 8" Fork Race BLK Rear Der Shifter Compatibility Shimano DynaSys11 The Marathon 365 directly replacing Rate Range:500 550Lbs The Marathon 365 directly replacing the Marathon GT 365 with a design the provides full grip in all seasons (even in cold wet and snowy conditions) thanks to the siped tread pattern Compatible with direct mount chainrings or five arm 110 BCD spider (sold separately) Rings Sold Separately Number of Chainrings No Rings Color Black Bearing Type Sealed Cartridge Crown Race 30 Defined Color Black S The IG 45 integrated headset features an aluminum cap bearing cover and crown race with super smooth rolling precision 45×45 bearings