DW is correct about a direct drive motor; definitely don't purchase if you live upstairs unless you want a workout. I purchased a 48V, 1000w motor from YESCOM just to try one out and it's great for errands even though the rear wheel must weigh 25 pounds. Top speed is 33+ mph (shut it down at that point, but don't think it would go much (maybe any) faster. Been reliable for two+ years which isn't unexpected since there is only one moving part (if you dismiss the bearings). Users report 15,000+ miles on the motor.