What is the lifespan of an electric bike?

best electric bike hub motor image

archa_pyus

Say you have an electric bicycle that is used daily, capable of a 30 mile range before needing re-fuelling and a speed range of 3-15mph.

What would be its likely lifespan, i.e. when would the whole thing have to be replaced?

I do not need exact measurements, just the general idea, as it is for a project for which i have to design an electric bike, which i know nothing about.

thank you!

Answer
The life span of an electric bike is mostly determined by the battery. Batteries can have a memory and if recharged before depleting it completely will reduce the capacity and can affect the range.

I would do some research on batteries. You can also look up motorized hubs to put on bikes, they make for the cleanest design.

Motors are rated in watts and most states have regulations that control the maximum amount of power that you can use.

http://www.electricbikesales.co.uk/info/buyingguide/

How can I figure out how fast my electric bike would go?

morbeckbra

I'm trying to put together an electric bike, with parts from http://www.electricscooterparts.com/. I'm using a standard bike frame that weighs about 30 pounds. How can I calculate how fast a hypothetical electric powered bike will go just from looking at the voltages and amperages of the batteries/motors listed on the website?

Answer
wrong data. you need motor rpm and drive train ratios. voltage and amperage gives you power, watts or horsepower. which will let you figure how long it will take to get to top speed.

example: a hub motor with no gears, running at 250 rpm will move a 26 inch bike wheel at about 20 mph.

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