Electrified Downhill bike

[zeropointbug]

Okay, thanks for the post, so I would guess on:

14s A123/45volts for a 45km/h or 28mph

15s A123/48volts for a 48km/h or 30mph

Pretty well 1mph/Volt for the 2806 on a 26" rim.

Here is where my pickle is, I would like to make it a 14s pack for the sake of charging, have it a split pack of 2x 7s packs on a dual pack charger, straight forward right. BUT, I would like to run 48V for the extra speed or range, but I don't like the idea of charging 3x 5s packs split charge.

Now unless someone here knows of a 15s A123 balance charger available, then sure 15s is the way, otherwise, it's 14s. I will not be using a BMS (waste of money IMO).