The Super B Derailleur Hanger Alignment Gauge is a precision tool designed to quickly assess and correct misaligned derailleur hangers, ensuring optimal shifting performance and preventing drivetrain wear. Easy to use, the tool attaches to the derailleur hanger and provides an accurate reading of alignment, allowing for precise adjustments. Compatible with a wide range of frame types, it’s made from durable materials to withstand frequent use in both professional bike shops and home workshops. This tool is essential for maintaining smooth shifting, especially after crashes or impacts that may cause hanger misalignment. KEY FEATURES Updated design to work with more frames, including thru axle frames Provides simple and accurate means to check the alignment of rear derailleur hanger and solve most derailleur shifting problems Fits to most wheels, 20~29"