Park Tool Derailleur Alignment Gauge and straighenner for keeping drive train in correct alignment.

• Gauge bar made of heavy gauge, chrome plated steel
• Adjusts to fit 20” to 29”+ wheels
• 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*