Park Tool DAG-3 Derailleur Hanger Alignment Gauge – 16-29" Wheel Tool

Is there anything more frustrating than a bike that won't shift smoothly? When your derailleur hanger gets bent, your shifting becomes sluggish, noisy, or completely unreliable, turning a great ride into a mechanical headache. You might spend hours fiddling with cable tension, only to realize the root cause is a misaligned hanger, which can lead to chain drops or even expensive damage to your drivetrain if left unchecked.

The Park Tool DAG-3 Derailleur Hanger Alignment Gauge is the professional-grade solution you need for precise Bicycle Repair. This essential tool makes Bike Maintenance straightforward by allowing you to check and straighten your hanger in minutes.

• Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+)
• Low-profile head fits low clearance thru-axle derailleur hangers and Shimano Direct Mount hangers
• Features a replaceable M10 threaded tip for long-term durability

Get your shifting dialed in perfectly and get back on the road with confidence.