And by the way , in the world of motorbikes , they refer to the front end geometry as " rake and trail " .
I can't direct you to a link at the moment , but this is a CONSTANT topic of discussion .
However , remember , they measure the "head tube" angle from the other side of the line .
Huh ? What does that mean ?
Well , take for instance what we would call a " 75 degree head tube angle " .
To the motorbike geometry experts , that'd be a " head angle of 15 degrees " .
Just take a 90 degree angle and split it up into two ( 2 ) parts . Now you can take your choice . Do you want to measure the one part and call it 75 degrees , or the other part and call it 15 degrees ?
On a motorbike , a "head angle" in the low 20's is considered radically steep and quick .
Raoul Delmare
Marysville Kansas