The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Zero stack uppers press into head tube with very little stack height. Zero stack cups press into the head tube with very little stack height. Features-Sealed black oxide bearings-Steel crown race with integrated seals-Compatible with tapered 1-1/8" to 1-1/2" steerer tubes, or straight 1-1/8" steerers with a conversion crown race (sold separately) Item Specifications-Color:Black-Weight:86-Crown Race:40-Bearing Type:Cartridge-S.H.I.S Lower:ZS55-Lower Stack Height:4