Park Tool 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.