Originally Posted by
Ryder1
I just measured all 37 bikes in my shop. Each time the measurement came out to 0.

The correct measurement will be small - 35 mm for low trail to 60 mm to emulate the vast majority of erstwhile racing bikes. It's easy to get it wrong.
I assume the OP bike is vintage? East German? If so i would not imagine Trek have any real data. Id assume the geo is 1960s, so id guess that 50 mm rake (not trail!) is a reasonable build target.