I had previously purchased the Grizzly 1023 table saw & HD roller frame. This is a fairly heavy machine, and recently when moving the saw to the center of the floor in my shop two of the caster wheels "threw a tread". Clearly the original caster wheels were inadequate for this much weight, as the current Grizzly catalog for the replacement wheel listing acknowledges. These are small casters, and the tight design of the welded-on caster bracket does not allow installation of larger diameter HD casters. To Grizzly's credit it now offers an upgraded caster assembly having cast iron wheels that fits the existing brackets to correct this problem. This is far from a precision product, and I would have preferred larger rubber-tired wheels with a higher load rating, but this is an adequate fix.