Derailleur hanger alignment gauge

Designed to control the alignment of rear derailleur hanger and solve most derailleur shifting problems, speciallythose with index shifting systems. Threads the tool into the derailleur hanger. The tool arm holds a gauge which marks the distance to the rim. Rotates the gauge with the wheel from 90° to 90° to check potential differences in measurements. If any, apply pressure to the tool arm to realign the derailleur hanger.- head and body of the tool are CNC machined- threaded spindle in hardened alloy tool steel