Originally Posted by
Yellowbeard
I guess it'll basically be a direct comparison of the mechanical advantage of a QR's cam to the pitch of the skewer's threads. Maybe I can measure the travel of the QR head myself vs. the thread pitch.
I think you're on the right idea here. Measure how much travel the QR head moves with the final tightening of the lever and compare that to an equivalent # of turns of an allen-key bolt-on. Be aware that there's a wide range of cam-profiles on QR levers. I had a set of Ringlé cam-twist QR skewers way back when. It kinda combined both, you give the QR lever a 1/3rd squeeze like normal, then twist it around 1/2 a turn for the final tightening.