Park Tool DAG-3 Derailleur Hanger Alignment Gauge

Features an all-new design, built to be light, accurate and versatile. This gauge measure alignment against bicycle rims, and rotates out of the way. 

• Precision-extruded aluminum body provides ample leverage for adjustments
• Low-profile head fits thru-axle derailleur and Shimano® Direct Mount hangers
• Compatible with 16" to 29"+ wheels
• Replaceable M10 threaded tip