There is confusion about these metal Roller Derby wheels. Roller Derby definitely made skateboards for a while. Some people think they are metal wheels used in (old timey) speed (roller) skating, while others think they might be for making the casting molds. The casting mold theory does not seem valid to me based on the shield already present (and worn) for the loose bearings. Holy cow, did you know you could still buy open bearing roller-skate wheels? From Sure Grip, of course.
– Thanks to Dennis Allgeier for the pics.
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