The Hope Tapered Headset is designed to fit frames which are sized to accept integral 1 1/8' top cup and 1.5' integral bottom cups, where the fork steerer has a 1.5' crown and a 1 1/8' top. They include replaceable custom made stainless steel bearings. The cups, taper ring and crown race, which is split for east installation and removal, are all machined from 2014 T6 Aluminium.