Here some pics and a build thread of my Fatbike with Bafang Ultra + Phaserunner.
I started the build in July, its almost complete now.
After building some BBSHD bikes it was time to get my hands on a Bafang Ultra drive.
I like the torque sensing idea and the integrated look of the G510.
Ordered a Ludicrous Ultra from Luna. (As it turned out later, it wasn't a Ludicrous)
And found a titanium frame on Alibaba.
https://bjcsti.en.alibaba.com/product/6 ... _G510.html
Exchanged quite some mails with "Linda" the very helpful salesgirl.
Frames are completely custom build.
I don't know much about bike geometry so went for a quite basic frame. (Large)
If I had to do it again maybe I would go for a smaller chainstay, a Rohloff mount and I would have moved the mount for the speed sensor a bit more backwards.
Delivery should take 45 days Linda said (as it was one week before Chinese new year) but I wasn't in a rush so I ordered a frame, seat post, handlebar and a titanium headset.
Frame was ready after 50 days but that interfered with my holiday so had the shipping postponed for a couple of weeks.
The frame was very well packed and arrived without any damage or scratches.
It felt very light but you could notice that the bulk of the weight was in the motor mount bracket.
I thought some extra weight could be saved there by drilling and grinding it down a bit but that was before I discovered how tough Titanium is.
Even my best drills had a hard time of making a small hole in it.
Frame weight was 2.75kg