Do BAFANG kits come with any literature that an American can read at all? Any technical support telephone number? I will need not only to know how to install the kit CORRECTLY but also learn how to operate and maintain the system including any needed lubrication.

If I buy from amazon, I'm protected in case something goes really bad. I do have a bicycle specialty tool kit I bought for when I customized my Schwinn Discover. I was even able to replace a freewheel or cassette with that tool kit. I swapped out stock 24-spoke wheels for Schwinn 36-spoke replacements. If memory serves me correctly, I also put in a bottom bracket cartridge, that Schwinn sent me, to replace the original bearings that were shot prematurely. I put a beefier axle in the rear as well.

Aren't the BAFANG mid-drive units permanently sealed and lubed for life?

Since I plan on using this rig to regularly exercise my German shepherd since I lack athleticism as an older man, I've not interested in going like crazy but at slow to moderate speeds in a well-controlled fashion. When shifting a derailleur on a mid-drive, does one let off the throttle when shifting gears? What is the correct method for upshifting or downshifting a mid-drive under throttle control?