Just a clarificationYou're looking for info regarding welding the mounting bracket used on those motors? If so, you're pretty much on your own to my knowledge.
Thought being here, if you are qualified to cut the required angles on a bike frame, then do the actual welding, you are likely going to be skilled enough to figure out the correct offset to get the chain line correct.
There are pre-welded frames available if you do some digging....
Personally, I would just go BBSHD. Similar power, and no cutting complex angles in tubing or welding involved....
Thanks for the replyHave you run into a show stopper on your install?
Thanks very much for the details.Mark,
I found a lot of information just googling "bafang ultra wiring diagram" or "bafang BBSHD wiring diagram". Several of those should have all the detail you might need.
In addition to that info, I would note that there are 2 different main harnesses. There's a 5 into 1 main cable that includes a place to plug in a headlight (as well as the brakes/display/throttle), and a 4 into 1 that does not. I KNOW the Ultra is able to control power to it's headlight using the "up" button. What I DON'T know, is if the older BBSxx motors are able to do this. The Ultra is able to use either harness. You don't see this mentioned anywhere I've seen. -Al