Dear lovely people of the fold. I come to you today in hopes of solving a menacing issue, that kinda prevents me from using my bike. What happens is, when I paddle hard the chain kinda skips. This can be dangerous and probably puts heaps of unnecessary strain on the gear hub.
All parts are original brompton parts, this started out of nowhere and the chain has been also now changed for a new one, which didn't fix the issue. All the sprockets chainrings and such seem to line up perfectly.
The image is a screencap from a video.
by Calavore