Enduro HDK-0012 Drop-In Headset Kit - IS42/28.6 Upper | IS52/40 Lower, 45x45, 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 45°/45° chamfers and tapered (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 ACB 4545 1125 SS (also known as MR042, 870E, MR121, MR070, MR084, MR116, TH-870E, and MH-P08) with 30.5mm ID, 41.8mm OD, and a width of 6.5mm Lower ACB 4545 150 SS (also known as HSS011, BAA0695K, TH-070, MR-128, and MH-P16) with 40mm ID, 52mm OD and a width of 7mm Kit includes upper bearing cap, hidden bolt topcap preload adjuster, with 45° crown race and compression ring