These are (approximately) the same dimensions as the Stevenson cyclekart plans. There is an 8 1/2" rise from the bottom of the beam to the top of the vertical link. In the plans a 3" tall kingpin is called for, however with the tube / bend combination I used, when I cut the beam I found I need a 4" tall king pin. Not a drama as I will be making these items as well. The beam is 30" from face to face.