I picked up a Yuba Mundo with a stuck seat post for a good price last weekend. I plan to convert it to a mid drive ebike. I set up a Yuba Kombi ebike for my wife a couple of years ago and now I want one for myself.

I am trying to remove the bottom bracket so I can put some drain cleaner in the seat tube and it is not budging. I got to looking at it and now I am curious if someone stuck the bottom bracket in backwards. I have never seen a cartridge bottom bracket that did not have a lip on the drive side. All of the ones I currently have in use have a lip in the drive side and it varies for the non-drive side.

You can see what I mean in the pictures if my words aren’t doing it for you. What do you think? Should I try to remove them as if the cups are reversed?

(note-the mid drive I will be installing does not use the bottom bracket shell threads so if they are damaged, it won’t matter as long as the shell is tact).


Non drive side with the lip

Drive side with no lip.