Bicycle handlebars almost universally attach to the frame of a bike with a vertical post that inserts intp a tube over the front fork. The handlebars can be adjusted for height and to compensate for a twist so the grips are in a comfortable position and the rider's arms are evenly spaced. Removing handlebars from a bicycle requires an open-end wrench sized to fit the locking nut or an adjustable wrench. Spray lubricant such as WD-40 can help loosen the locking nut to make the job go faster.
Locate the locking nut and bracket that secures the handlebars to the bicycle frame. When seated on the bike, the locking nut is usually located on the tube above the front wheel fork, on the right-hand side. The nut secures a bolt installed through a steel U-shaped bracket that wraps around the handlebar post and the fork tubes to hold the parts securely.
Spray the locknut with a burst of lubricant such as WD-40 and wait a few minutes for the lubricant to work its way into the threading to loosen the nut.
Turn the nut counter-clockwise with a wrench to loosen and remove the nut from the bolt. This will loosen the clamp around the handlebars and front fork tube.
Pull the handlebars straight up and out of the front fork.
Adjust the handlebars to a comfortable height to reduce arm fatigue so longer rides will be more enjoyable.
Secure the handlebars tightly and test them before riding the bike again. It is dangerous to have handlebars come loose and begin rotating freely in the middle of a bike ride.