Park Tool DAG-3 Derailleur Hanger Alignment Gauge

Gauge bar made of heavy gauge extruded aluminum Adjusts to fit 20" to 29"+ wheels Replaceable threaded tip Upgraded, large inner shaft for added strength* Tighter tolerances for improved accuracy Improved clearance and reach to fit more frame/hanger combos including low clearance thru axle derailleur hangers Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+) Replaceable M10 threaded tip Low-profile head fits low clearance thru-axle derailleur hangers and Shimano® Direct Mount hangers Length: 16.5” (420mm) Published Weight: 22.75 oz. (645g) The new DAG-3 is an indispensable shop tool that can be used to both measure and straighten misaligned derailleur hangers solving a high percentage of shifting problems. 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.