Lirinsegie Derailleur Hanger Alignment Gauge DAG-2.2 — Stainless Steel, 20–29" Wheel Compatible, Workshop-Grade

If your bike shifts poorly after a crash or a wheel swap, a misaligned derailleur hanger is often the culprit. The Lirinsegie DAG-2.2 provides a precise, workshop-grade tool to measure and correct hanger alignment so your gears return to smooth, reliable indexing. It’s built for hobbyists and mechanics who want repeatable results without expensive shop visits.

How does the DAG-2.2 measure hanger alignment?

The DAG-2.2 uses a calibrated measuring rod and a rotatable diamond-shaped straightener bar to reference the rim at multiple points. By sliding the rod through the adjustable slide seat and seating the unit against the frame, you can rotate and compare distances to spot any deviation.

• Stainless steel tube frame for rigidity and consistent reference points.
• Diamond-shaped straightener bar offers clear contact angles for rims and spokes.
• 360° rotation on the head allows measurements around the wheel circumference.
• Adjustable rubber pads protect rims while ensuring firm contact.

What steps are involved in using the alignment gauge?

Setup is straightforward: insert the positioning screw into the head, secure the lock screw, pass the measuring rod through the slide seat, and tighten the adjust screw. Rotate the head to compare distances around the rim and gently bend the hanger until readings match the reference.

• Insert positioning screw and engage the lock head for stable setup.
• Feed measuring rod through slide seat and set rubber pads against the rim.
• Tighten adjust screw to lock the rod, then rotate and note deviations.
• Make small corrections to the hanger and recheck measurements until aligned.

Which wheels and frames does the tool support?

The DAG-2.2 is sized to work with most modern bicycles, covering wheel diameters from 20" to 29". It’s compatible with mountain bikes, road bikes, hybrids, and many kids’ and commuter bike setups provided the hanger is externally accessible.

• Works across a wide wheel range: 20" to 29" compatible.
• Suitable for MTB, road, hybrid, and many commuter bicycles.
• Effective on frames with removable or replaceable derailleur hangers.
• Not intended for internal or integrated hanger designs without access.

What construction and features make it reliable?

The gauge combines a stainless steel tube frame, a large inner shaft, and a durable diamond straightener bar for strength and accurate repeatability. Rubber protection pads and a locking mechanism keep measurements consistent without damaging rims.

• High-strength stainless steel body for long-term accuracy.
• Large inner shaft and 360° rotation for robust corrections.
• Rubber pads protect wheel rims while maintaining contact.
• Comes tested and quality-controlled; packaged with an instruction sheet.

Who is this for: The Lirinsegie DAG-2.2 is aimed at home mechanics, bike shop technicians, and serious cyclists who prefer to maintain and tune their own drivetrains. If you want faster, more precise gear indexing after wheel changes or minor crashes — without guessing — this tool gives repeatable, professional-level alignment at an affordable price. Instructions are included in the package for first-time users; experienced mechanics will appreciate the durable construction and predictable results.