Review on 24-Pack Heavy Duty 2" Swivel Caster Wheels with Rubber Base, Top Plate & Bearing for Maximum Mobility by George Cochran

They should not be called "heavy duty" in any way. An easy job at best. With 4 casters on the platform, 15+ lbs per caster makes it difficult to move or turn to change direction. If they roll in the same direction, it's fair, but it's still not easy to roll. And to change direction during movement, it's almost easier to rock the object from side to side on the rollers to take the weight from side to side so it can rotate. Actual wheel diameter is 1-7/8" (not quite 2" in case that matters). My batch had the usual Chinese factory rubber smell, but it wasn't bad or noticeable when I used it outdoors (I did). A good price for a very small bike if you want light use, but not the best choice for medium or heavy use.