Hi Folks - I'm looking to do a mid-drive conversion on my Kona Blast mountain bike, and looking at specs for the Bafang motor I'm considering, there is reference to three bottom bracket widths: 68, 100, 120mm. As near as I can tell, the bottom bracket on my bike is approximately 76mm. Are the three sizes mentioned above standard sizes, and I have an oddball? And is there any way to make this work?

Thanks,

romomoto