Bicycle handlebar assembly

A bicycle handlebar assembly, comprising a handlebar, two bases, two brackets, and two auxiliary handlebars;

• the handlebar having two positioning seats located close to left and right sides of a center of the handlebar, each of the positioning seats having two apertures arranged in tandem;
• the two bases being mounted on top of the respective positioning seats of the handlebar, each of the bases having two through holes arranged in tandem and corresponding in position to the apertures of corresponding the positioning seat and an arc-shaped concave portion with a constant curvature on a top thereof;
• the two brackets each including a sleeve section, an extension seat, and an adjustment seat;
• the sleeve section having a receiving hole extending axially;
• the extension seat extending from an outer side of the sleeve section, an armrest being disposed on a top of the extension seat;
• the adjustment seat extending downward and being located between the sleeve section and the extension seat, an underside of the adjustment seat having an arc-shaped convex portion with a constant curvature to mate with the arc-shaped concave portion of the top of the base, a lower section of the adjustment seat having two elongate grooves arranged in tandem and corresponding in position to the two through holes of the base, one side of the adjustment seat having two accommodating holes communicating with the respective elongate grooves for accommodating two locking pins each having a locking hole, two angle adjustment bolts being inserted from bottom ends of the apertures of the positioning seat of the handlebar through the through holes of the corresponding base into the elongate grooves in the adjustment seat of the corresponding bracket and locked with the locking holes of the two locking pins;
• the two auxiliary handlebars each having a rear end and a front end extending upward at an angle, the rear end passing through the receiving hole of the sleeve section of the corresponding bracket and being secured to the corresponding bracket.