Handlebar group for bicycles, comprising: - a handlebar , comprising a central section , for fixing to a handlebar stem , and two lateral gripping sections ; - a handlebar stem comprising in turn: - a front head , comprising first fixing means configured for locking said handlebar ; - a rear collar , comprising second fixing means configured for fixing to a tube of a fork; - a central extension , for connection between said front head and said rear collar ; characterized in that said first fixing means of the handlebar comprise: - a front tubular body shaped to accommodate said central section of said handlebar , said front tubular body comprising a front part shaped to surround a front face of said central section , and a rear part shaped to couple with a first end of a tightening rod , - and a front portion of said central extension , shaped to rest on a rear face of said central section of said handlebar ; said central section of said handlebar being locked between said front part of said front tubular body and said front portion of said central extension ; said second fixing means comprising: - a rear tubular body shaped to accommodate an end section of a tube of a fork, said rear tubular body comprising a rear part shaped to surround a rear face of said end section of a tube of a fork, and a front part shaped to couple with a second end of said tightening rod , - and a rear portion of said central extension , shaped to rest on a front face of said end section of said tube; said tightening rod being positioned to longitudinally cross said central extension , and being configured to connect said front tubular body and said rear tubular body . - a handlebar , comprising a central section , for fixing to a handlebar stem , and two lateral gripping sections ; - a handlebar stem comprising in turn: - a front head , comprising first fixing means configured for locking said handlebar ; - a rear collar , comprising second fixing means configured for fixing to a tube of a fork; - a central extension , for connection between said front head and said rear collar ; - a front head , comprising first fixing means configured for locking said handlebar ; - a rear collar , comprising second fixing means configured for fixing to a tube of a fork; - a central extension , for connection between said front head and said rear collar ; - a front tubular body shaped to accommodate said central section of said handlebar , said front tubular body comprising a front part shaped to surround a front face of said central section , and a rear part shaped to couple with a first end of a tightening rod , - and a front portion of said central extension , shaped to rest on a rear face of said central section of said handlebar ; said central section of said handlebar being locked between said front part of said front tubular body and said front portion of said central extension ; said second fixing means comprising: - a rear tubular body shaped to accommodate an end section of a tube of a fork, said rear tubular body comprising a rear part shaped to surround a rear face of said end section of a tube of a fork, and a front part shaped to couple with a second end of said tightening rod , - and a rear portion of said central extension , shaped to rest on a front face of said end section of said tube; - a rear tubular body shaped to accommodate an end section of a tube of a fork, said rear tubular body comprising a rear part shaped to surround a rear face of said end section of a tube of a fork, and a front part shaped to couple with a second end of said tightening rod , - and a rear portion of said central extension , shaped to rest on a front face of said end section of said tube; said tightening rod being positioned to longitudinally cross said central extension , and being configured to connect said front tubular body and said rear tubular body . <EOS>