An upper headset assembly compatible with your Airdrop frame.
The 40 series ZS44 is a high quality, all alloy upper headset assembly that we've tried & tested. The 6061 T-6 alloy crown race fits perfectly into the zero-stack headtube, the bearings are super smooth and well sealed, the cover and even the top-cap are all alloy (no plastic involved). The top cover is also compatible with Cane Creek's Interlok headset spacer rings for the perfect set-up. Overall we've found it to be a light, durable and super reliable headset. Fit & Forget.