Originally Posted by philiboy
I want to buy an electrical bike, but I am confused... How many miles can I ride it without charge it?
A few more things. With Electric bikes, it's really all about the battery. You really need to build your bike around the battery because the battery pretty much dictates how fast and how far you will go. For example, if you buy a 48v20AH lifepo4 battery, and it has a max continuous amp rating of only 25 amps, then you need to get a controller that is max 20 amps continuous and nothing more or you will destroy your battery. So lets say you got a lifepo4 battery that has a max continous amp rating of 40 amps, then you could get a 35 amp controller for it since it's well under the 40 amp rating.
You have two different types of motors: hub motors and chain driven motors. I have a 5303 crystalyte hub motor. It's a front hub motor. And I have a 24 - 72v 35amp controller for it so I had to get a lifepo4 battery that had a 2C rating ....2C rating ona 48v20AH battery means that 20AH * 2C = 40 amp continous max rating so I needed that kind of battery to work with my motor and controller or the controller would fry a weaker battery. Hope I'm making sense. It's called the "C " rating. I'm just assuming you haven't read this, that's why I'm telling you thiis. Sometimes manufacturers will give the "C" rating and sometimes they'll just say 30 max continuous amp rating for that battery....both say the same thing.
Anyway, you got these hub motors to choose from:
Those are some of the well-known hub motors. Anyway, hope this gets you started. Beware of crappy e-bay lifepo4 batteries and crappy e-bay motor kits. I bought my motor and controller from http://ebikes.ca
....that's a good place to start and you can e-mail a guy named Justin if you have some questions and he'll answer them. I think he's the owner of ebikes.ca . He's a pretty good guy. That company has been around a while. They do good work.