with the Performance CX motor. I read somewhere that it can help with upshifting and downshifting (eShifting, manual or auto?) but I do not know how it works. Is this correct? Or is this version dependent? Is it something that can be upgraded? I also read that the "walk assist" is not available in the US version, which is ok. I am mostly interested in the gear shift assist aspect of it. Thanks in advance for your input. Happy ebiking!