Park Tool USA DAG-3 Derailleur Hanger Alignment Gauge

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 being compatible with 16” to 29”+ wheels, whilst rotating out of the way to clear seat stays, racks, and other obstacles, allowing 360 degree measurement

The long, precision-extruded aluminium body is built to exacting tolerances and provides ample leverage for making adjustments

Thanks to the low-profile head, it fits low clearance thru-axle derailleur hangers and Shimano® Direct Mount hangers

Made in the USA and covered by Park Tool’s legendary limited lifetime warranty