I recently began rebuilding my workshop around new, wheeled systems. And the problem is that sometimes, when I seek to work in space that isn’t as confining as my garage, I head out to my driveway. And some wheels – 2-3″ ones, in particular – can be stopped by branches, small rocks, or small deviations in the driveway. I don’t own my driveway, and it’s made of asphalt that is loaded with many rocks – 1-2″ diameter, some smaller, few larger. The problem is that some casters won’t travel over them.

I bought a rolling toolbox with a set of 2″ casters. I’ll be replacing those with casters that stand 6″ tall and use 4″ wheels – These wheels will allow me to move my 250 pound toolbox (when loaded with tools) over those 1/2″ to 1″ differences in driveway height, without pushing it over. If you plan to go over small lips or small bumps, bigger wheels are helpful. Smaller wheels are roadblocks. So think it through before swapping out wheels.