An absolute essential for any bike with a carbon steerer tube. Steerer Tube Bung designed specifically for use with carbon fibre fork steerer tubes. bung is 50mm long.
FSA 1 1/8” Carbon Fork Expander Plug Compression Plug for Threadless Headset
Trurovem Aluminum Alloy Carbon Fork Expander for 1-1/8 Inch 28.6mm Steerer Tube, Bike Headset Compression Bolt with Wrench, Adjustable 22.2-25.4mm for Mountain Bike Suspension(50mm)
Bike Headset Fork Expander for 28 6mm Steel Aluminum Alloy Carbon Fiber Front Fork Compatible with Headset Top Cap Screw Key Expander
Zanthicia Bike Headset Expander Carbon Fiber Front Fork Easy Installation Lightweight Durable Accessories Mountain Bike Mountain Road Parts Fork Expander Bung
Dolvitrny Bike Headset Fork Expander Tool (28.6mm OD), Aluminum Alloy Headset Expander with Top Cap Screw, Compatible with Carbon Fiber & Steel Forks
Bicycle Fork Steerer Tube Expander for Carbon Fork Safety and Suspension Fork Stability with 25.4mm 28.6mm Fit (M)