Originally Posted by
fietsbob
^ Opinion^ its not guaranteed ... Your bike has other problems if its twitchy.
Not opinion. Fact.
Narrow handlebars create a twitchy, unstable ride if cut too small. Bars that are slightly wider than shoulder width apart will help you get your shoulders into a better position, giving you better stability. It also helps you get your upper body into the pedal stroke more by pulling up as you push down on the the pedal, which is tough to do if your bars are too narrow.