I have a brand new Air 9 Alum that I can not get the play out of the headset unless I crank down on the top cap then it is too tight. The headset goes from slight play to super tight with a half turn of the top cap. I checked the crown race to make sure it is seated properly and it is, I think the play is on the top side not the bottom. My bike came with a FSA headset but the bearings are not stamped so I can not confirm diameter but I would think Niner is on their game in that regard. What other headset are you guys running on the Air 9 and what came with your bike from Niner? I am thinking of trying a cane creek 40 series.
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Thread: Headset Issue Air 9