Featuring some of the lowest stack height bearing cover options available, the Cane Creek Hellbender 70 Slam ZS44/28.6 2mm - Upper Only is a premium headset designed for riders who want to lower their handlebars without compromising bearing longevity and proper preload.Made with 6061 T-6 Aluminum cups and covers, this headset is both lightweight and strong. The top cover is specially designed with the lowest stack height possible for both ZS and IS headsets. The alloy dual-seal crown race provides excellent seal efficiency, while the low friction carbon-friendly captured compression ring ensures smooth operation.The Hellbender 70 Slam features premium sealed HELLBENDER stainless bearings for durability. The stack height is reduced to 2mm for ZS headsets and 4.6mm for IS headsets, allowing riders to achieve a lower handlebar position. Upgrade your bike with the Cane Creek Hellbender 70 Slam ZS44/28.6 2mm - Upper Only - the perfect choice for riders who want to lower their handlebars without compromising bearing longevity.