Lower than expected top speed

[Bradda]

Hi everyone. I'm new to this sphere but have extensive experience in the push bike world and decent experience with RC hobbies.

I built a conversion kit for my 700c commuter bike.

My question is regarding top speed. It pulls well up to ~16km/h then feels like it cuts power. I expected faster.

The motor/controller/display came as a kit in Australia, seller stated it's for a 16" wheel that should be limited to 25km/h and that because I built a 700c wheel it won't go 25 (my maths says hub RPM x rollout = speed, and 700c>16")

The hub is a Bafang G311 250, external casing says D15, internal spline says D09, windings are 16 pole 18 slot, though I don't know what that means or if it's helpful.

The supplied display has no part number or markings. The controller looks like a generic 6A continuous unit.

The battery is a 36v 10s2p made from Samsung 21700-50S cells with a DALY 20A BMS.
700c wheel with 37mm tyre.


Have I just mismatched components and 16km/h is all I should expect from it or is the controller or display limiting my speed?

 

[Bradda]

https://www.aliexpress.com/item/1005008341638656.html

17A with S900, manual online says display can modify pole pairs, max speed, displays watts, has Z91 plug and fits my 31.8 bars.

 

[99t4]

if it has the right motor pin out, is there a potential it won't like the hall sensor/speed sensor output?

Just be aware there is no real standard phase wire/ hall sensor wire (pinout or wire color) among products, even within a single mfr's/vendor's offerings.

 

[Bradda]

Just be aware there is no real standard phase wire/ hall sensor wire (pinout or wire color) among products, even within a single mfr's/vendor's offerings.

Thank you, that is helpful to know.