Hello,
A few weeks ago, I acquired a Viking 5-quart stand mixer. So far it's been working great. However -- though maybe I am blind, I could not find in the included documentation from Viking, any reference to the revolutions per minute at different speed levels.
Sorry if this has been posted before, but I found a handy online reference that lists the RPMs for the various speeds, and thought I'd post it in case any other Viking users would find it useful.
http://www.vikingmixer.net/speed.html
Cheers, and happy bread making!