In its simplest form, a derailleur-alignment tool is often little more than a pry bar with an adjustable feeler. They're often crude, and can be frustrating to use considering the feeler's position is compromised every time it contacts the rim or is moved...
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...
An alignment gauge is essential for diagnosing and repairing bent or misaligned derailleur hangers, often the source of shifting problems. The DAG-3 features an all-new design, engineered and built to be light, accurate and versatile. The sliding indicator...