Park Tool DAG-2. 2 Derailleur Gauge The Park Tool DAG-2. 2 Derailleur Gauge was made for one purpose in mind, which was to bend your derailleur hanger back into place. The DAG 2. 2 has been updated with higher tolerances to fit greater variety of frames. It can adjust to fit 20" to 29" wheels and has improved clearance and reach to fit more frame/hanger combos. Features Gauge bar made of heavy gauge, chrome plated steel Replaceable threaded tip Upgraded, large inner shaft for added strength Tighter tolerances for improved accuracy Improved clearance and reach to fit more frame/hanger combos including low clearance thru-axle derailleur hangers Adjusts to fit 20" to 29"+ wheels Related Articles: REAR DERAILLEUR HANGER ALIGNMENT Manufacturer's Part No: DAG-2. 2 UPC: 763477002624 | Park Tool | Dag-2. 2 Derailleur Gauge Chrome