Pz Racing Quill to Ahead Bike Handlebar Stem Adapter - 22.2mm to 28.6mm
This adapter will allow you to fit an ahead style stem to a bike which has old style quill type stem. Stem fitting 28.6mm 1 1/8". 40mm 1 1/8" Stem clamping section. Zipp Service Course Stem 6 deg - Silver.