Some stock bikes won't over 20 at 36 volts, because this about their top speed.

Sometimes that 20 mph limit is tied into a federal law requiring that all ebikes sold in the US not be capable of going above 20 mph. these kits tend to have a silly speed limiter, which is defeated by simply unplugging the connection. But then you might hit 22 mph on it.


A 48 Volt Lithium battery combined with most typical hub motor kits should get you to 25+ mph on level ground, no pedaling. You'll have to slow down to under 20 and help pedal on the hills, depending on how steep, but it will feel like you are riding a normal bike on level ground while doing it.