These are excellent wheels/castors. We needed wheels that could withstand a heavy load and go off the street and into my house. As for the negative reviews about the smell. All new rubber products have an odor, but in my opinion it was far from what others have left. Ordered, received, opened and left at home until I built a stretcher. As for negative feedback about vibration. These wheels are "profiled" so that there is very little vibration when driving on a smooth surface. If you only want "smooth" work for concrete, buy a smooth and durable roller. As for the negative comments about vibration. These heavy-duty wheels/casters have grease fittings on the pivot structures to keep them running smoothly after greasing.
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