The Park Tool DAG-2.2 is the workshop derailleur hanger alignment gauge: it measures hanger misalignment and lets you straighten it, helping to diagnose and solve many shifting problems. A misaligned hanger causes skipping, missed shifts and wreaks havoc on the whole drivetrain.
The gauge threads onto the hanger in place of the rear derailleur and uses the wheel rim as a reference: the indicator is set against the rim at one point and compared at the opposite position, so the measured gap shows how far the hanger is out of line. It adjusts for 16" to 29"+ wheels and fits most frame/hanger combinations, including low-clearance thru-axle hangers.
How to align a derailleur hanger with the DAG-2.2
- Mount the bike in a repair stand with the wheels level and check that the rear wheel is properly seated in the frame.
- Remove the rear derailleur and thread the gauge onto the hanger; if the threads are damaged, chase them first with the Park Tool TAP-10.
- Set the indicator against the rim at 3 o'clock, then rotate gauge and valve to 9 o'clock: with a gap under 3 mm the hanger is horizontally aligned.
- If the gap exceeds 3 mm, bend the hanger by half the gap, in small increments, rechecking both sides.
- Repeat the vertical check between 6 and 12 o'clock: the hanger is aligned when three points 90° apart are all within 3 mm.
- If fenders, racks or stays block the indicator, use the O-rings as markers and slide the indicator back to clear the obstacle.
Why choose Park Tool DAG-2.2
- Compatible with virtually all derailleur-equipped bicycles
- Adjustable for 16" to 29"+ wheels (ISO/ETRTO rims 317 to 630+)
- Also fits low-clearance thru-axle hangers
- 405 mm workshop tool for repeatable measurements on every bike
After alignment always recheck the limit screws and derailleur indexing; a hanger bent several times that fails during correction must be replaced. To diagnose and correct bent hangers reliably, the Park Tool DAG-2.2 derailleur hanger alignment gauge is the reference tool.
TECHNICAL SPECIFICATIONS
General
- Code: DAG-2.2
- Brand: Park Tool
- Type: derailleur hanger alignment gauge
Dimensions
- Length: 405 mm (16")
- Weight: 937 g
Compatibility
- Wheels: 16" to 29"+ (ISO/ETRTO 317 to 630+)
- Hangers: most frame/hanger combinations, including low-clearance thru-axle hangers
- Bikes: virtually all derailleur-equipped bicycles
The Park Tool DAG-2.2 is the workshop derailleur hanger alignment gauge: it measures hanger misalignment and lets you straighten it, helping to diagnose and solve many shifting problems. A misaligned hanger causes skipping, missed shifts and wreaks havoc on the whole drivetrain.
The gauge threads onto the hanger in place of the rear derailleur and uses the wheel rim as a reference: the indicator is set against the rim at one point and compared at the opposite position, so the measured gap shows how far the hanger is out of line. It adjusts for 16" to 29"+ wheels and fits most frame/hanger combinations, including low-clearance thru-axle hangers.
How to align a derailleur hanger with the DAG-2.2
- Mount the bike in a repair stand with the wheels level and check that the rear wheel is properly seated in the frame.
- Remove the rear derailleur and thread the gauge onto the hanger; if the threads are damaged, chase them first with the Park Tool TAP-10.
- Set the indicator against the rim at 3 o'clock, then rotate gauge and valve to 9 o'clock: with a gap under 3 mm the hanger is horizontally aligned.
- If the gap exceeds 3 mm, bend the hanger by half the gap, in small increments, rechecking both sides.
- Repeat the vertical check between 6 and 12 o'clock: the hanger is aligned when three points 90° apart are all within 3 mm.
- If fenders, racks or stays block the indicator, use the O-rings as markers and slide the indicator back to clear the obstacle.
Why choose Park Tool DAG-2.2
- Compatible with virtually all derailleur-equipped bicycles
- Adjustable for 16" to 29"+ wheels (ISO/ETRTO rims 317 to 630+)
- Also fits low-clearance thru-axle hangers
- 405 mm workshop tool for repeatable measurements on every bike
After alignment always recheck the limit screws and derailleur indexing; a hanger bent several times that fails during correction must be replaced. To diagnose and correct bent hangers reliably, the Park Tool DAG-2.2 derailleur hanger alignment gauge is the reference tool.
TECHNICAL SPECIFICATIONS
General
- Code: DAG-2.2
- Brand: Park Tool
- Type: derailleur hanger alignment gauge
Dimensions
- Length: 405 mm (16")
- Weight: 937 g
Compatibility
- Wheels: 16" to 29"+ (ISO/ETRTO 317 to 630+)
- Hangers: most frame/hanger combinations, including low-clearance thru-axle hangers
- Bikes: virtually all derailleur-equipped bicycles
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