The regular wheels are 1" x 7" give or take and the jumbo wheels are 2" x 7". To unmount them just take a knife or exacto to the seam of the wheel to cut the glue, then you should be able to easily pull the rubber off the wheel. Searching for the thread that you were looking for I find two that might be of interest:
Forums at Splitcoaststampers
Forums at Splitcoaststampers
If you are ever having trouble searching you can search the forums here via google by typing the following in the search bar:
what I'm trying to find site:splitcoaststampers.com/forums
Obviously you would replace the "what I'm trying to find" with what you are wanting to search for!
HTH