I made it out to do the Madison last week at Northbrook myself. Was talking to a local that races a lot of masters nationals and worlds and he was talking about how crazy gear selection has gotten and how it's all changed recently.
I'm nothing of a racer but I always thought I was running heavy in the mid 90" range. Second guessed my 92ish 49x14 for the Madison but then was dragging on the last few laps.
You can run whatever cranks you want here as it's so flat but even still I believe I run 167.5