I was intrigued by the picture of the twin-downtube frame 45 racer lately posted in the foot-shift thread.
I do know that H-D produced a limited number ( probably 25 ) of a bike listed as the DAH in the late 20s or early 30s, incorporating a special ohv conversion and in at least some cases, a special twin down-tube frame. At least one bike appears to have been fitted with a springer fork converted to trailing-link operation. Given the detail differences between the remaining specimens, I rather get the impression that it was really a series of factory competition bikes using the ohv conversion engine as the only assembly common to them all.
the bike shown on here has a very modern-looking frame which appears to be an all-welded tubular frame, as far as can be seen. The rear axle detail appears to have a flat axle plate with straight tubes welded along the top and bottom, much as modern custom frames often have.
Does anyone know anything about this frame or any contemporary units?