Hey buddy
Nice ride!!! looks like my bike when I take off haha
I use both front and rear of this motor with the GM 48v battery. Fully charged its 54V and this yields around 40km/h probably more like 37/38 with just running 1 motor and standard other wheel.
Unfortunately the only way you will get a greater top speed is by upgrading your battery to a 48v considering you are using the internal controller.
I would not suggest going faster than 30km/h on your bike anyway as those types are really only designed for 20-30km/h but you have a nice helmet should anything go wrong!
![Cheesy :D](https://goldenmotor.com/SMF/Smileys/default/cheesy.gif)
What you have is probably perfect for the build type, and you will have better range with your battery (16Ah) too. But if you really want that extra max 10km/h more you will have to upgrade your battery....