Originally Posted by
scozim
I picked up an IRD cartridge bottom bracket and their Swiss thread cups to use on my low end Batavus project. Supposedly you're supposed to be able to just pull the English thread cups off and swap them.
I'm not up to date on your project, but are you saying the Batavus has a Swiss thread shell with a British BB in it right now? That's understandable, but I'm a little confused as to why a Dutch bike would have a Swiss thread BB shell.
Swiss thread is a little larger diameter than British, and a different pitch. They are not interchangeable. But the smaller diameter British thread can be forced into a Swiss thread shell. Shouldn't be, but often is when you have to made do, because of the rarity of Swiss thread BBs.
Originally Posted by
scozim
The non-drive side was a little stubborn but I was able to pull it off by hand. The drive side is a different story with the cup not wanting to budge at all. Looking for any ideas to get it off. I really don't want to tear it up that much trying to get it off.
No offense intended, but I'm assuming you understand that both British and Swiss thread BBs have a LH thread on the drive side cup, and it removes righty-loosey (turning clockwise.)
If you're turning it the right direction, I would suggest some heating up of the BB shell with a heat gun or even a blow dryer. Not enough to burn the paint, but enough to make it uncomfortable to touch. That usually helps unless the BB cups are aluminum.