Name: Park Tool DAG-2.2 Derailleur Alignment Gauge
Brand: Park Tool
Rating: 4.8 (5 reviews)

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See available Bike gauges and measuring tools

The DAG-2.2 Gauge provides fast and precise adjustments for your rear derailleur to keep it aligned and running smooth.

Adjustment bar is made of heavy gauge, chrome plated steel.
Adjusts to fit 20 to 29in.+ wheels.
Replaceable threaded tip.
Tight tolerances for precise readings.
O-ring reference guides lets you work around obstructions, like racks or fenders, without needing to remove them.
Fits a variety of frame/hanger combinations, including low clearance thru-axle derailleur hangers.