I measure all of my bikes, including angles (STA and HTA), then plug the measurements into BikeCAD. Angles are easily measured to ± 0.1° with a Wixey WR300 Angle Gauge.



My 1987 Paramount as measured.



Here's the published geometry. My bike is a stock 62cm frame.



Notice the HTA is actually 73.3° instead of the 73° spec.



The STA is right on spec at 74°.