put our Heads Together
Join Date: Jun 2003
Location: southeast pennsylvania
Bikes: a mountain bike with a cargo box on the back and aero bars on the front. an old well-worn dahon folding bike
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Keep in mind that for the purposes of riding your bike, extra weight is not much of a problem if it's an e-bike. (it will make it more difficult to lift your bike off the ground though!)
Basically, if the weight is really too much on an uphill, then just turn on the power assist. If you want exercise, don't use the power assist on flat ground... and don't use it on the uphills either if you want even more exercise.
Usually e-bike systems weigh from 20 pounds (if using lithium batteries) up to 50 pounds (if using lead acid batteries). That includes motor + battery, and a tiny bit of weight for controller and throttle.