Bottom 50mm is threaded.
Adjustable MTB Bike Fork Expander Bolt Compression Plug 28.6 Carbon Fiber Fork
1-1/8 Bike Headset MTB Threadless 34 44 44-56 mm, Straight Tapered Tube Mountain Bikes Road Bicycle Double Sealed Bearings Headsets, for Frame Fork Expander Plug Star Nut
Bike Headset Expander Top Cap Carbon Fiber 1-1/8" MTB Road Stem Fork Headset Cap
MTB Bike Headset Upper Assembly Top Cap Aluminum 1-1/8" Stem Fork Expander Bolts
