BBB Extender Quill to Ahead Bike Handlebar Stem Adapter. BBB Model Number: BHP-21. BBB TubeExtend Steerer Extender 28.6mm BHP-22 Black. This adapter will allow you to raise up an existing ahead type stem which or fit an ahead style stem to a bike which has old style quill type stem, it enables you to make your steering tube longer without affecting the ahead system.
