The Dropset 5 integrated headset features the patented GripLock bearing cap, which preloads the headset independently of clamping onto the steerer, so it retains preload far better than the competition and is impervious to the ill effects of load spikes from large hits and heavy braking. This means smoother steering, no more creaking, and a longer lasting headset. Engineered, manufactured and assembled in Portland, Oregon USA, backed by the King Lifetime Warranty Legendary made-in-house bearings GripLock retention design for dependable headset adjustment Compatible with included baseplate and 45 degree integrated crown races 42mm 45x45 upper bearing for 6.85-7.05mm bearing ream depth 52mm 45x45 lower bearing Specifications Bearing TypeCartridgeColorMatte BlackCrown Race30Defined ColorBlackS.H.I.S LowerIS52S.H.I.S UpperIS42S.H.I.S. Stem Clamp Diameter28.6 Threadless