I was thinking about building a variation on the Bilenky Viewpoint hybrid tandem. This would be a tandem touring bike. Since the stoker rides up front over the 20" front wheel I want to make sure headset bearings can handle the loads and that I have sufficient distance between the bearings. Anybody have guidelines for shock loads on a small diameter bicycle wheel? Are there industry practices for estimating the design maximum bending moment generated by the front wheel/fork assembly when under shock loads?
Thanks in advance.