A lower headset assembly compatible with your Airdrop frame.
The 40 series ZS56 is a high quality, all alloy lower headset assembly that we've tried & tested with all our frames. The 6061 T-6 alloy crown race fits perfectly into the zero-stack headtube, the bearings are super smooth and well sealed, the fork crown race is well sealed and mates up perfectly with the headset for a snug fit. Overall we've found it to be a light, durable and super reliable headset. Fit & Forget.