Park Tool DAG-2.2 Derailleur Alignment Gauge

.top{margin-bottom:30px;}.top li{margin-left:5%;margin-right:5%;margin-top:10px;line-height:120%;list-style-position:outside;} A misaligned derailleur hanger can cause skipping, and 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, the DAG-2.2 adjusts to work with wheels from 16" to 29"+.