Park Tool DAG-2.2 Derailleur Alignment Gauge Tool

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The DAG-2.2 is an indispensable shop tool that can be used to both measure and straighten misaligned derailleur hangers solving a high percentage of shifting problems.


  • Gauge bar made of heavy gauge, chrome plated steel
  • 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

This product was added to our catalog on March 7, 2018

Thomas Kunich
Wednesday, Jan 11 2023 (about a year ago)
Park Tool DAG-2.2 Derailleur Alignment Gauge Tool
This is a very good tool to align rear derailleur drop outs that have been bent from dropping your bike over which screws up the smooth shifting of your derailleur across the total range.