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Ah, so the no weight gain claim is based on the ridiculously light weight caliper and rotor they use offsetting the extra motor with. Makes more sense.
Also, the hubcap is apparently solid or optionally lexan backed and seals the front of the wheel, but that still doesn't explain how grime won't get in there from the back. Those unlubricated gears seem problematic... at least they're straight-cut, but I would assume they're going to be wear parts that require fairly frequent replacement. Fine for a track car, but maybe not so much a daily.
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