You can look at a bike and tell how much the owner loves it by the headset, and King headsets are reserved for our most precious bikes. Chris King makes all of its bearings in house, which guarantees their roundness and hardness, and then assembles each headset by hand from a stock of components. This particular headset is designed for frames with a tapered head tube 34mm to 49mm, and a fork with a tapered 1. 5 1. 125in steerer. It will also accept a straight 1. 125in steerer with King's Reducer Baseplate, available separately.