Park Tool Derailleur Hanger Aimer DAG-2.2

The DAG-2.2 is an essential shop tool that can both measure and straighten misaligned derailleur hangers, effectively resolving a significant percentage of shifting issues.

- 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
- Enhanced clearance and reach to accommodate more frame/hanger combinations, including low clearance thru-axle derailleur hangers

A misaligned derailleur hanger can lead to skipping, missed shifts, and cause general chaos in your bicycle's drivetrain. The DAG-2.2 is an essential tool that can measure and straighten misaligned derailleur hangers, diagnosing and fixing many shifting problems. It is compatible with virtually all derailleur-equipped bicycles and adjusts to work with wheels ranging from 16" to 29"+.