An alignment gauge is essential for diagnosing and
repairing bent or misaligned derailleur hangers, often the source of
shifting problems. The DAG-3 features an all-new design, engineered and
built to be light, accurate and versatile. The sliding indicator can
measure derailleur hanger alignment against bicycle rims of any size,
and rotates out of the way to clear seat stays, racks, and other
obstacles, allowing 360 degree measurement. The long, precision-extruded
aluminum body is built to exacting tolerances and provides ample
leverage for making adjustments.