I don't have any first-hand advice for you, but I do have a cycling buddy who is Type I and we sometimes talk about her diabetes and managing it. She completed Ironman Arizona this past April.

She uses a mix of a long-acting and short-acting (normal?) insulin. From what I've read, and she's read & heard (I always forward Type I stuff I see to her), low blood sugar is the big-time enemy. A recent study where Type I diabetics were attempting to tightly control their blood sugar levels was stopped because the experimental (tight blood sugar control) group had a substantially higher death rate. My friend's take on it, was that low blood sugar is too be avoided more than high.

Anyway, just wanted to let you know that there are other Type I women out there kicking *** on the bike!