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Mine is 8T and is the latest gen, with composite gears and a temperature sensor. I cracked it open after a few hundred miles and the gears all still look good, but I'm probably going to run it at slightly lower power to protect clutch and gears. Geared hub motors feel a lot more torque-y at low RPM than direct drive, and tend to have better efficiency at lower speeds, so I probably don't need nearly as many watts anyway.
At first glance the Leafbike motor looked like any of the other eBay hub motors, but the efficiency graphs suggest otherwise. I might snag one to try.
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