Like most Crux owners, I have experienced issues with the standard headset from Specialized - I could never quite get the preload right or the headset would loosen up over time. The fix for that is BAA2471! It installed in a jiffy - upper and lower bearings, cover, dust cap and bolt. It is very well made and a 100% drop in replacement. The only recommendation I have is to put some grease on the o-ring of the cover and the top of the fork tube to make it easy to slide everything on. Highly recommended!!

What a fantastic piece of kit, the flexibility that works with different stem bolt spacing makes this hard to beat.