flyfisher wrote:

Another dumb question......Is the diameter of a pulley measured by the
overall outside diameter or the smaller inside diameter where the
bottom of the belt rides?

Outside.

Technically, it's the "pitch diameter" but everyone just measures the OD. You
can easily see this at the hardware store, measure a 2-3-4" step pulley and
you'll see the OD of the small end is 2", big end 4" ..

GWE