Park Tool Derailleur 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"+. 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.)