The Columbus Compass Integrated Headset 1-1/4" Carbon is a precision-engineered tapered headset for Columbus frames using the IS42 / EC44 standard. Featuring 45° stainless steel angular contact bearings (ACB), it delivers smooth, long-lasting steering. Compatible with Zydeco, Zydeco Lala, Nemo Tig Gravel (up to MY23), and Nemo Allroad, Very Best Of .