Feature

●Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+)
●Low-profile head fits low clearance thru-axle derailleur hangers and Shimano Direct Mount hangers
●Replaceable M10 threaded tip


Description

Park Tool DAG-3 in use straightening a misaligned derailleur hangerPark Tool DAG-3 in use straightening a misaligned derailleur hanger

Park Tool DAG-3 Bicycle Derailleur Hanger Alignment Gauge

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.

  • 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)
  • Weight: 22.75 oz. (645g)

EASY TO USE

Indicator of DAG-3 encountering bicycle rackIndicator of DAG-3 encountering bicycle rack

Indicator of DAG-3 rotating to clear bicycle rackIndicator of DAG-3 rotating to clear bicycle rack

Indicator of DAG-3 measuring past bicycle rackIndicator of DAG-3 measuring past bicycle rack

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.

BUILT TO LAST

Detail of Park Tool DAG-3Detail of Park Tool DAG-3

The long, precision-extruded aluminum body of the DAG-3 is built to exacting tolerances and provides ample leverage for making adjustments.

Original Park Tool bike shopOriginal Park Tool bike shop

TRUSTED SINCE 1963

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.

Product information