Please except my correction Al, the Speedmaster is the same. BTW how do you think extreme rake of a chopper handles in slow turns--yeah there all show. But what are they telling you--they will have a tendency to flop inward in a slow turn. The principal stands though Re: the geometry affect from rake and trail. But my quick examples used were off. The Bonneville and the Bonne T100 are 28degree the Thruxton is 27 and change. Speedmaster and America 33.3 degrees. Many sport/racing bikes are as little as 23 degrees. My old Brit bikes you never gave it a thought in a slow lock turn with feet up and you could spot a green rider by the duck walk. I have ridden for many-many years but darn near dropped my America because of the rake affect that surprised me. Now I more on guard.
Geoff
