Shifting isn't quite up to par? The Park Tool DAG-2 Derailleur Hanger Alignment Gauge can provide a solution. An updated version of the popular DAG-1, the DAG-2 gauge utilizes a longer measuring pointer, longer threaded stud and a longer, narrower alignment boss to fit a wider variety of bikes.
Solves a multitude of derailleur shifting problems, most notably with index shifting systems
Extremely steady in operation and simple to use
Threads directly into the derailleur hanger
Alignment of the derailleur hanger is accomplished by applying pressure to the tool's arm - the results can be checked instantly
Made with heavy gauge steel and chrome plated for long shop life