X tools pro gear hanger alignment toolx tools pro gear hanger alignment toolthe pro gear hanger alignment tool is designed to check and adjust the alignment of your rear derailleur hanger and solve most shifting problems especially those with index shifting systems if you cannot get your gears working 100 then your hanger alignment is most probably the reason and it is the first thing you should check featuresthreaded end threads into hanger threads measuring pointer checks for parallelism a