If my motor rpm is 1750 and i add a 3 inch drive pulley to it, what is the speed of the pulley said to be? Is the 3 inch pulley going at 1750. I need to know the initial speed for my calculations for crown pulley setup when I make the small wheel attachment that Dancom has on his site. I have 2 step pulleys with 5 steps going from 3 inch down to 1 inch. If I invert them in relation to each other like the belt grinders for sale on Beaumont Metal Works website it would give me 5 speeds. If the belt is around the 3 inch pulley rotating at 1750 rpm going to 1 inch pulley that would give me a rpm of 5250. If the belt was on the 1 inch pulley rotating at 1750 going to a 3 inch pulley the the speed would be 583 rpm. Then the pulley attached on 1 end of a shaft rotating at 583 and turning a 4 inch wheel on the belt grinder going to the small wheel attachment of 2 inches would give the speed at the attachment of around 1166 rpm. It would be within a reasonable speed range for the small bearings I think. Any thoughts?