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Team Cycles£115.00Visit shop Park Tool Unisex Black Dag-3 Derailleur Hanger Alignment Gauge In
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The Park Tool DAG-3 Derailleur Hanger Alignment Gauge is designed for cyclists and bike mechanics who need to diagnose and repair shifting problems caused by bent or misaligned derailleur hangers. Its key benefit is providing a precise and versatile tool for accurate alignment measurements, ensuring smooth and reliable gear changes. A potential caveat is the need for proper technique to avoid over-adjusting the hanger. This gauge features a lightweight, all-new design with a sliding indicator for 360-degree measurements, compatibility with a wide range of wheel sizes, and a precision-extruded aluminum body for leverage and accuracy.
| Model Part Number | QKDAG3 |
|---|---|
| Brand | Park Tool |
It's used to measure and correct the alignment of the derailleur hanger, which is the piece that connects the rear derailleur to the bike frame. Proper alignment is crucial for smooth and accurate gear shifting.
The DAG-3 is compatible with wheel sizes ranging from 16" to 29"+, including common ISO/ETRTO rim sizes from 317 to 630+.
Yes, the DAG-3 features a low-profile head designed to fit easily with low-clearance thru-axle derailleur hangers, as well as Shimano® DirectMount hangers.
It's recommended to check your derailleur hanger alignment if you experience persistent shifting problems, after a crash or impact, or if you notice the derailleur cage looking significantly out of parallel with the wheel.
Yes, the DAG-3 features a replaceable M10 threaded tip. This allows for easy replacement if the tip becomes worn or damaged.
Use gentle, controlled pressure when making adjustments. It's better to make small, incremental adjustments and re-check alignment frequently rather than applying excessive force.
Ensure the gauge is properly seated on the derailleur hanger and that the indicator is making contact with the rim without obstruction. Check that the threaded tip is secure and not damaged. Verify wheel is centered in the frame.
Rotate the indicator arm as needed to navigate around seat stays, chainstays, or rack mounts. The design allows for 360-degree access by repositioning the indicator.
The M10 threaded tip is replaceable. Contact Park Tool or an authorized dealer for a replacement part.
Setup: The DAG-3 requires no complex setup. It's ready to use out of the box. Ensure the threaded tip is securely in place before use.
Compatibility: The DAG-3 is compatible with virtually all derailleur hangers and bicycle frames. It accommodates wheel sizes from 16" to 29"+ (ISO/ETRTO rim sizes from 317 to 630+). Its low-profile head is specifically designed to work with modern thru-axle and Shimano® DirectMount derailleur hangers.
Care: To maintain accuracy and longevity, clean the DAG-3 after each use with a dry or slightly damp cloth to remove dirt and grease. Store it in a dry place. Periodically check the threaded tip for wear or damage; if damaged, it can be replaced.
