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Park Tool
DAG-2.2 Derailleur Hanger Alignment Gauge

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DAG-2.2 Derailleur Hanger Alignment Gauge

Quit fiddling with your rear derailleur's barrel adjuster and address the issue of sloppy shifting at its source. Park Tool's DAG-2.2 Derailleur Alignment Gauge helps the home mechanic identify and correct a bent derailleur hanger, and — compared to the DAG-2 model — it features a stronger shaft, tighter tolerances, and improved clearance and reach. The sliding arm encompasses wheels from 20 to 29in.


  • A shop-quality tool that measures and straighten misaligned derailleur hangers Improves shifting performance and prevents derailleurs in the spokes
  • Gauge bar made of heavy gauge chrome plated steel for durability
  • Replaceable threaded tip increases the life of the tool
  • Upgraded larger inner shaft adds strength
  • Tighter tolerances improve its accuracy
  • More clearance and reach fit more frame/hanger including thru-axle hangers
  • Also fits Shimano Direct Mount hangers
  • Item #PAR001N
[gauge bar] chrome-plated steel
20 - 29in wheels
Recommended Use
Manufacturer Warranty
limited lifetime