Used inside Volae risers to attach the Aheadset adjusting bolt to the star nut. This clever device allows perfect adjustment of the headset on a Volae. It comes with four 1 cm spacers, which allow the rider to adjust lower the handlebars if needed. Use a tubing cutter to shorten the riser and simply remove the required number of spacers.
When using the Volae Handlebar setup and the Aheadset Extender, you need to have at least three inches of fork steertube protruding above the topf of the headset. If you have less than three inches, you will need to use a TerraCycle Glideflex instead.