Reddit reviews Motorcycle Handling and Chassis Design:

I think bicycle language may differ from most automotive/motorcycel engineering language in this regard, but rake directly affects trail, though not vice-versa. "Steerer-angle", from the vertical, or caster, is what I was referring to as rake. I see that in bicycles people refer to the trail offset as 'rake'. My apologies.

Both John Bradley's and Tony Foale's books have great introductions to the basic trigonometry of steering 2-wheeled vehicle.