module axe_guidon (){
translate([0,0,-50])
cylinder(h=100, r=38/2);
}

module ouverture (){
translate ([0,0,-25])
linear_extrude(height = 50)
polygon(points=[[17,0],[-17,0], [-25,25], [25,25]]);
}

module corps (){
 translate([0,10,0])
   rotate([90,0,0])
     cylinder(h=40,r=25);
}

module encoche (h){
  translate([-30,-62,h])
  cube (size=[60,40,2.7]);
}

module velo() {
  difference (){
    corps ();
    axe_guidon ();
    ouverture();
    encoche(14);
 }
}

$fn=500;
translate ([0,0,30])
rotate ([90,0,0])
velo ();