Park Tool DAG-3 Derailleur Hanger Alignment Gauge
Best precision tool for cyclists troubleshooting shifting issues at home.
This precision instrument is the gold standard for diagnosing and correcting bent derailleur hangers. Its versatile, low-profile design ensures compatibility with modern thru-axle and direct-mount systems, making it an essential tool for achieving crisp, reliable shifting.
$148.95
at
Grey Ghost Bicycles
More Derailleur Hanger Alignment Gauge options
Who it's for
- Home mechanics troubleshooting persistent, frustrating shifting issues
- Owners of modern bikes with large frames or fat tires
- Serious mechanics needing a tool that lasts a lifetime
Who should skip it
- Casual riders who only occasionally perform minor bike maintenance
- Beginners uncomfortable with delicate, high-stakes mechanical adjustments
- Cyclists with limited storage space or small, portable toolkits
Performance breakdown
Measurement Precision
Extruded aluminum body ensures tight tolerances for pinpoint alignment accuracy.
Compatibility Range
Handles everything from small kids' bikes to modern 29-inch mountain rigs.
Ease of Adjustment
Sliding indicator and rotating head make 360-degree checks intuitive and fast.
Build Durability
Rugged construction stands up to daily use in professional repair shops.
Clearance Versatility
Low-profile head easily navigates tight thru-axle and direct mount setups.
Ergonomic Leverage
Long handle provides ample torque for correcting even stubborn, bent hangers.
Key Specs
Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+)
Replaceable M10 threaded tip
Low-profile head fits low clearance thru-axle derailleur hangers and Shimano Direct Mount hangers
Length
16.5" (420mm)
Weight
22.75 oz. (645g)
Still have a question?
Ask Metto anything about the Park Tool DAG-3 Derailleur Hanger Alignment Gauge before you decide.
