Increasing the length (stack height) of a Fork Steerer (Cut to Short) - Hambini Engineering
Bicycle Head Up Adapter Adjustable Height Extender Fork Stem Steerer Tube | eBay
Steerer Tube Extender – Velobike
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Bike Front Fork Extension Head Tube, Aluminum Fork Head Tube 28.6mm Straight Pipe Standpipe Bike Fork Stem Extender for Road Bikes, Mountain Bikes, MTB, BMX, Silver
Mountain Bike Fork Extension Riser Stem Lengthen Extender 3cm Head Tube Adapter 25.4mm To 28.6mm - Bicycle Stem - AliExpress
Titanium Head Tube Extension — TI CYCLES FABRICATION
3X Bicycle Front Fork Head Tube Replacement Tools Aluminum Alloy Bicycle Stright Steerer Tube Fork Tube Extension - Walmart.com