I posted this to ES facebook page, but I guess its better to put it here also.
I'm building my hybrid bike and one idea was to use 2-speed gearbox.
Initially I wanted to use Babetta automatic gearbox, but the guy whom I was gonna buy it, acted like a fool and ruined my plans.
So, next candidate was Riga V-501 engine which is really massproduced and easy to to get here.
It hasreally simple hand(cable) operated gearbox and gear ratios quite ok for electric motor.
So, I'm gonna use only internals and design custom casing for it, which eventually will be stressed member on my bikes rear swingarm.
I'm using Alien Power CA80 motor.