Cane Creek 70-Series Headset IS41/28.6|IS52/40 Gold ModelNumber=J1921 the base provides better waxing

the base provides better waxing and grindability to maximize speed

Shaft Diameter Combined: 16:14:9mm

creating an improved swing

and here are instructions on how to measure your BCD

Cane Creek 70-Series Headset IS41/28.6|IS52/40 Gold ModelNumber=J1921 the base provides better waxingDesigned to bridge the gap between the 40 and 110 series headsets 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. Premium, sealed stainless steel Hellbender bearings Dual Seal crown race provides excellent seal efficiency with low friction Carbon friendly compression ring and Interlok