Sorry to resurrect an old thread, but I've only found this and one other thread menitioning the Kolbe brand. It seems they are a bit obscure.

Long story short, I just purchased a Kolbe mixte to build up as a commuter, and I was wondering if you knew what threading the Kolbe bikes used for their bottom brackets? I'd like to explore the possibility of replacing the old bottom bracket and cranks as I've heard cottered cranks are no picnic as far as maintenance goes.

Also of note, this mixte has the same internal dynamo wire routing as the one in the first post.