CANE CREEK 40-SERIES IS42/28. 6 UPPERHeadsets are an important part when it comes to the steering of your bike. The Cane Creek 40-Series IS42/28. 6 Upper is the upper portion of the Cane Creek 40-Series headset. The 40-Series is the workhorse of the Cane Creek headsets and is robust, lightweight, and long-lasting. It features sealed black oxide bearings and a carbon-friendly compression ring captured in the top cover that keeps the shims in place. It is Interlok spacer compatible. Features Interlok spacer compatible Sealed black oxide bearings Carbon-friendly compression ring SPECIFICATIONSTechnical Description IS42/28. 6Top Type ISTop Head Tube Inside Dia. IS42Stem Clamp Dia. 28. 6mm Top Stack Height9mm, 15mm Top Bearing Type Cartridge Material Aluminum Weight34g (Short Cover)Manufacturer's Part Number BAA0094KBAA0095KCane Creek Headset Finder To figure out which headset you need for your particular frame and fork, see Cane Creek's Headset Finder by clicking HERE. | Cane Creek | 40-Series Is42/28. 6 Upper | Black | Is42/28. 6 Short Cap 9Mm