https://komking.de/en/product/hope-headset-tapered-is41-is52/
Hope Headset Tapered | IS41 / IS52 - Komking e.K.
hopeheadsettaperedk
https://shop.grandrapidsbicycles.com/cane-creek-40-is41-286-is52-40-short-cover-headset.html
Cane Creek 40 IS41/28.6 IS52/40 Short Cover Headset Black - Grand Rapids Bicycle Co.
Grand Rapids' best shop for bikes, fitting, service, tune ups, knowledge and more. Selling bikes from Salsa, Cannondale, Surly, Marin, Pivot and Yeti.