I'll update this review if I use them in a few months, but for now I'll comment on dual ball bearing wheels - they only have ONE set of balls. Bearings in which the rollers rotate. The wheel itself turns on a simple steel shaft. The truth is I've only tried to use it once. It was very difficult to get the car running and I gave up. They might be enough for something like an ATV, but I can't recommend them for any size car.
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