I just did a Google search on custom carbon fiber bicycle frames. I only came up with two companies: Calfee and CAS.

Calfee is in my husband's words, "The undisputed king of carbon fiber." If we were looking to go that route, that's who we would choose.

When we were at Death Valley we talked with a woman who has a custom Calfee tandem - very small woman, very light bike! She does a lot of ultra distance events and she was just thrilled with her tandem.

Here's a link to a picture we took of them on their way up Dante's View.

http://www.tandemhearts.com/calfee.jpg


I noticed you're in the Bay Area. You might try going to Bicycle Outfitter in Los Altos and talking with them. They do both Calfee and Trek (since Dogmama brought up Lance ) and they'd be able to tell you if you really needed to get a custom bike or if a production model would fit.

I have heard Sausalito Cyclery is also very good, but haven't done any business with them myself.

Good luck and enjoy the search!

Veronica