Description Note: this is the top half of a headset only, not a complete headset. You will still need a separate lower headset assembly. This Cane Creek 40-Series top headset (short cover) is the perfect upgrade for your Aventon track bike. The 40-Series was designed with three things in mind - performance, durability, and value. This headset is fully sealed, with Black Oxide bearings to keep dirt and water out. These headsets have solid build-quality and might be the last ones you ever buy. Applications: top headset assembly comes with a short cover and fits IS42-top frames, such as: Aventon Cordoba 2016-2017 (Limited Edition and Standard models) Aventon Mataro Low In addition to Aventon products, it can also fit many other makes/models. SHIS Dimensions: IS42/28.6, Cane Creek part # BAA0094K SPECIFICATIONS TECH DESCRIPTIONIS42/28.6/H15/K BOTTOM TYPEIS - Integrated TOP HEAD TUBE INSIDE DIA.42.00mm STEM CLAMP DIA.28.6mm TOP STACK HEIGHT9mm TOP BEARING TYPEBlack Oxide, Sealed MATERIAL6061 WEIGHT34g TECH DESCRIPTIONIS42/28.6/H15/K BOTTOM TYPEIS - Integrated TOP HEAD TUBE INSIDE DIA.42.00mm STEM CLAMP DIA.28.6mm TOP STACK HEIGHT9mm TOP BEARING TYPEBlack Oxide, Sealed MATERIAL6061 WEIGHT34g