A misaligned derailleur hanger can cause skipping, missed shifts, and wreak general havoc on your bicycles drivetrain. The Park Tool DAG-3 Derailleur Hanger Alignment Gauge is an indispensable shop tool that can be used to both measure and straighten misaligned derailleur hangers, diagnosing and solving many shifting problems.
The DAG-3 features an all-new design, engineered and built to be light, accurate and versatile.
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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 of the DAG-3 is built to exacting tolerances and provides ample leverage for making adjustments.
Since our origins in the back of a bike shop in 1963, it has been our sole mission to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. As with our other 500+ tools, the DAG-3 is a product of our decades of experience and expertise in the industry, in the shop and on the trail.