I've gotten new ones from some of the big box home-improvement joints,
the iron ones on my VW engine dolly came from a now-defunct chain.
These are supposed to be good for 1000 lbs each. Since they live on a
concrete floor, I don't worry about wheel marks. I've seen some large
ones at the local True Value, too, solid rubber. Ace had some smaller
ones, 3" or so. One of the local tool stores that handles import stuff
as well as Dewalt and Milwaukee has a large assortment of iron and
rubber-tired castors, all sizes up to 12". Retail prices, though.
Surplus Center in Lincoln, NE had a lot of them in their store, more
than made it into their catalog. Just wish they were closer instead of
having to limit my trips to when I go through there a couple of times a
I can't believe no one's mentioned:
Two thousand five hundred ninety one different types of casters. They
carry a mind-boggling array of industrial products.
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