In response to tips on making them go 60mph
To increase speed would require a pretty good understanding of how these bikes work.
they are carefully balanced to give optimal distance from a full charge.
any increase in speed would greatly affect possible distance.
The only way to counter that would be a larger Ah (amp hours ) battery, but this would only solve the distance problem and at best you would still only get around 18 to 20 mph
The extra strain on the motor controller and hub motor would also lower their lifespan drastically.
No tweak or modification would get these vehicles up to 60mph they simply are not capable of it.
20mph maybe but the trade off with lifespan of the vehicle simply isnt worth it.
To get 60mph you would need to change 3 components.
the battery from 36v 10Ah to 48v 30Ah (preferably 72v ) and a suitable controller , 48volt controllers are easier to find but even these usually max out at just over 30mph.
You would also need to change the back wheel as the brushless motor would need upgrading to a suitable motor for the controller and battery.
Any of these modifications would make the vehicle no longer legal to rid on U.K. roads and would be for off road use only as it would no longer qualify as an Electrically Assisted Pedal Cycle (E.A.P.C.)
Any modification to the bikes speed would also require an upgraded breaking system simply for safety reasons.
That would be a lot of expencive modifications for something that would become illegal to use.
Im already considering purchasing one of the newer faster models. it would be a much better investment than modifying.