Park Tool DAG-2.2 Derailleur Hanger Alignment Gauge
An indispensable shop tool, the Park Tool DAG-2.2 derailleur hanger alignment gauge measures and straightens misaligned derailleur hangers, solving a high percentage of shifting problems.




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- Gauge bar is made of heavy-gauge, chrome-plated steel
- Adjusts to fit 20 to 29 in. wheels
- Threaded tip is replaceable (replacement tips not included)
- Large inner shaft adds strength
- Tight tolerances offer improved accuracy
- Improved clearance and reach to fit more frame/hanger combos than past versions, including low-clearance thru-axle derailleur hangers
- Compatible with virtually all derailleur-equipped bicycles, including those with Shimano Direct Mount hangers
- Length: 16 in. (41 cm)
Made in USA.
View all Park Tool Bike Tire GaugesBest Use | Cycling |
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Weight | Unavailable |
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Fix your rear derailleur yourself!
I was having issues with my rear derailleur a few years ago. I decided to purchase this Park Tool to remedy the situation myself. The build quality is great. It's easy to use, and really makes rear derailleur hanger adjustments simple. They have a newer version now. I'm not sure what the differences are. I know that I saved money by repairing my bike myself. This tool has paid for itself a few times over now... I've fixed about half a dozen different bikes with it.