Review on 🔧 CycloSpirit Derailleur Hanger Alignment Gauge for Perfect Bike Maintenance by Will Micheals

After trying to get the rear derailleur set up to no avail, I suspected the derailleur hanger might be bent. Ordered this tool and indeed it showed the hanger was out of spec more than 3 times. Straightening it out and getting rid of those nasty shifting issues was a simple process. My only caveat is that you need to make sure the set screw on the top of the tool is tight enough for the spindle to turn, but with no gap between it and the handle. You will understand what I mean when you receive the instrument.