The Park Tool DAG-2.2 Derailleur Hanger Alignment Gauge, click to enlarge
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Item # DAG-2.2

/ Tools / Derailleurs & Shifting / Frame & Fork

Derailleur Hanger Alignment Gauge

A misaligned derailleur hanger can cause skipping, missed shifts, and wreak general havoc on your bicycle's drivetrain. The DAG-2.2 is an indispensable shop tool that can be used to both measure and straighten misaligned derailleur hangers, diagnosing and solving many shifting problems. Compatible with virtually all derailleur-equipped bicycles, and adjusts to work with wheels from 16" to 29"+.

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DAG-2.2 Features

  • Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+)
  • Fits most frame/hanger combos including low clearance thru-axle derailleur hangers
  • Length: 420 mm (16.5")
  • Weight: 645 g (22.75 oz.)



  • Bicycling Review Park Tool’s Derailleur Hanger Alignment Gauge is on its third iteration. The DAG-2.2 gets a head design refined to make it stronger, and the longer, narrower threaded tip is replaceable and better fits hangers that have a hood or tight frame clearance. The tighter tolerances of the 2.2 mean I can get hangers aligned a bit quicker. It also meant less wiggling of the arm on the head to find an alignment point, resulting in better precision when aligning new or bent hangers.

  • BikeRadar: Best New Bike Gear Poor rear shifting is all too commonly caused by a mis-aligned rear derailleur hanger. To correct this, a derailleur alignment tool provides the answer and there’s none more commonly used than the Park Tool DAG. The DAG-2.2 is a shop-tool that’s priced to be accessible to all.

Parts & Accessories


Replacement Parts

DAG 2.2 Derailleur Hanger Alignment Gauge