- Ideal headset choice for any bike where weight savings is a priority without compromising durability or performance - Internally contoured and relieved 6061-T6 aluminum for minimized weight and maximized strength - Low-friction upper bearing seal completely seals cup from contaminants and is fully captured by the top cover with no loose parts. Lightweight aluminum with steel hybrid Hellbender Lite sealed cartridge bearing - Alloy dual-seal crown race provides excellent seal efficiency with low friction - Carbon friendly compression ring S.H.I.S. / Stack Weight IS41/28.6 / IS52/40 / 9mm/1mm 54g IS42/28.6 / IS52/40 / 9mm/1mm 54g IS41/28.6 / IS47/33 / 9mm/1mm 54g IS42/28.6 / IS47/33 / 9mm/1mm 54g IS42/28.6 / IS49.5/40.5 / 9mm/1mm 54g ZS44/28.6 / ZS56/40 / 8mm/4mm 90g
