I bought these casters for a cart that hides under a shelf. The cart typically weighs about 160 pounds and sits idle for some time. These skates, which I still love, have small flat spots from the seat. Not a big deal as I'm only moving the cart a meter at a time. If they're used more regularly they probably won't develop flats, but as far as I understand it that's not a problem. It just wheezes a little at first.
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