Continuing with the trike coverage, here's a Sacramento based Knucklehead trike from the early '70's. 
The seats and pipes look to be inspired by Tom McMullen's Corviar trike. Photo courtesy of Dr. Sprocket.



It's a small world after all! The very same Bob Wise submitted the two black conept drawings for Street Chopper's (June 1972), Trick Trike contest. My art is on the facing page. I posted this a few years ago which lead to me meeting the good doctor.