Yeah, there's been a huge explosion in exactly this arena over the last 5 years; I've seen dozens of Kickstarters.
Problem is... that's exactly the opposite of what I'm trying to achieve. If I wanted that, I'd buy an old dirt bike and build it. Literally a weekend project if you have a welder and torches.
No... my intent was just to make sure I don't wind up stranded somewhere between home and one of the local parks if my knee gives out; I intend to pedal this monstrosity most of the time.
I chose hub motor because it looked like a lot less dicking around with little bits of stoopit barely-heavy-enough bracketry and crap; so far not sure it was such a good idea.
First off, it's a lot more weight than I was figuring; even with LiPo power instead of cylindrical cells, this thing is gonna turn what was pig into a bulldozer.
Second... due to the fact of it being a "regular bike" version instead of a "fatbike" version... a lot more fabricobbling required than originally thought. Given the differing offsets and the fact it doesn't use conventional bike bearings & skewers means that getting the hub centered in the frame is a really big assache...
See... from here, things look pretty promising; the hub uses the same rotor as the original wheel, and a couple washers is all it'll take to get the brakes in line...
... but here, we see that because the axle shaft is literally twice as fat, a large portion of the rotor doesn't engage with the pads. This means either grinding out the axle slot to allow the whole thing to drop in more (not a bad idea in this case) or more monkeying around fabricobbling something to get the calipers aligned properly. But that's just the small stuff...
...this is the real problem. Due to the way the shaft is cut away for the wires, there's literally only aboot another 4-5mm I can offset in the right direction before I run out of usable thread. Ugghhh...
Getting the new rim centered in that space... is going to take a lot more offset in the laceup than I feel is safe, even allowing for some wiggle room by squishing the axle plates closer together.
Def gonna be a little more cogitating involved here, I think.
mnem