Enduro HDK-0011 Drop-In Headset Kit - IS42/28.6 Upper | IS52/40 Lower, 36x45, Angular Contact Bearings Tapered, Black EA Headsets

This IS42/IS52 Integrated/Drop-in headset fits bike head tubes with 42mm top IDs and 52mm bottom IDs, bearings with 36°/45° chamfers, and tapered (1-1/8" x 1-1/2”) steerer forks Features top-quality 440C balls and races, dual-lip seals top and bottom, 90% fill with high-pressure waterproof grease, and are guaranteed for as long as you own the bike Upper 1-1/8” bearing ACB 3645 1125 SS (also known as IS42, ACB30418K, and MH-P03K) with 30.5mm ID, 41.8mm OD that features a step down to just under 41mm at the top of the outer race, and a width of 6.3mm Lower 1-1/2" bearing ACB 6808 SS (also known as HD 1404K, BAA0006K, MR-127, MR-196, MH-P25K, BAA1132, and TH MR019) with a 40mm ID, 52mm OD and a width of 6.5mm Kit includes upper bearing cap, hidden bolt topcap preload adjuster, with 36° crown race and compression ring