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...

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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 can measure derailleur hanger alignment...

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