1. Downtube size is the same with LightCarbon. It's not removable, If u want to swap battery U have to release the motor first.
2. I will use FOX DPX2 Kashima 200x57. It's easy to get.
And Yess, chainstay is 440mm legth.
Frame arrive yesterday. Looks good, solid production. Downtube slimmer than CEF50. Now is time to make custom battery, will go for 36v 540Wh if possible.
https://www.emtbforums.com/threads/bafang-m510.26180/post-499328
U can read there, 2 people already confirm. I have FC 2.0 controller but not yet replace because I'm still on recovery for broken collarbone :D
on off issue is common problem for FC 1.0 controller version, so the solution is change the controller to FC 2.0.
Only DP C245 3.0 bluetooth 5.1 can connect to Go+ App