I ride an electric moped as my only form of motorized transportation.
I love it.
It is a steel mountain bicycle frame that has a 48 volt, 21 ah battery bank, a bmc geared brushless pm hub motor, and a 35 amp infineon controller.
Range has not been measured but it will happily get me from concord/billerica/bedford to Lowell and back on a single charge.
a friend of mine has a very similar size battery, and a motor almost twice the wattage of mine and he very easily gets 40+ miles per charge with an average speed of 25 mph and a top in the 30s
My personal top speed has yet to be measured but in a previous configuration with a 36 volt setup my electrical engineering prof visually guestimated me at 30 mph
the 48 volt pack gave an obvious improvement in acceleration and speed.
Handling actually improved greatly with the added weight of the battery bank and motor.
It loves to lean in tight turns and responds wonderfully but with a slight delay to conscious countersteering, in this respect it is more like a motorcycle than most other stuff I have ridden.
bike frame: $10 from a yard sale with the brand name scratched off, probably with a rock or something of similar finesse.
motor kit: $300 for the hub motor prelaced into an extruded double wall rim, a full twist throttle, and a sh**y controller
$180 for a 35 amp controller and wiring harness for 48 volt battery
$230 for the battery
$120 for a truly universal charger (Mastech industrial scr multichemistry, choose from 6, 12, 24, 36, or 48 volts and 1, 2, 5, or 10 amp charge rate)
Tax, fees, regstration: apart from sales tax on the components $0.00; F**k the law