Takes 1.5” headtube (only, not compatible with Cannondale) down to use a 1 1/8” fork.
The cups, taper ring and crown race (which is now split for easy installation and removal) are all machined aluminium. Sealing is achieved through an adjustable taper ring cover and integrated rubber seal
The bearings also incorporate their own sealing and being made from stainless steel resist corrosion and it’s by-products are much better than a conventional steel bearing.
An aftermarket crown race is also available which has 3mm of extra height built into it, which again can be used to help with clearance.