I have a 2001 Lemond Zurich frameset and the BB is a regular english 68mm threaded BB...It's certainly not pressfit and not BB30. Unless some Lemond bikes were being made with some other standard at that time, and I'm pretty sure they weren't, you are looking at getting a 68mm english threaded bb. The good thing is that these bb are so very common that you can find one dang near everywhere. I'm pretty sure my Zurich originally came with some Shimano Octalink BB which I believe the BB-5500 is.

Bottom Bracket Standards - Slowtwitch.com - bottom bracket standards.