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with 80/20 frame, chains is so much easier than gears its not even funny. We use 80/20, gonna use chain drive exclusivly (cept for the gearbox on the bosch, that gives us a good reduction we don't need to pay extra for)
edit: Its not hard to get different motors to be withing 10 or less RPM's of each other, we got like 5 or 6, which is about 1 or 2% difference, which will be fine over a period of 2 minutes. Over ten hours, you would probably burn the motors up, but 2 minutes is fine.
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