Unior Hanger Genie derailleur hanger alignment gauge

The Hanger Genie is a foldable tool for aligning shift eyes to ensure precise shifting.Compatible with all wheel sizes from 20"-29", it can be screwed directly into the thread of the shift eye. The precise feeler gauge can be fixed, so that you can keep this in view when aligning in different positions. Due to the rotatable arm of the tool, the derailleur hanger can be aligned precisely along the impeller.