New Downtube + question about computers

[uforgot]

I recently purchased a Downtube folding bike. I'm going to keep it in the trunk of my car, and take it with me when I fly. I love it, it rides like a full size bike, and I know that Vickie (Fastdogs) likes hers! Anyway, a question. With it folding, I was wondering about putting a computer on it. Would the wires get in the way, and if I go wireless, would the smaller wheel keep the magnet too far away to get a good signal? What kind of computers do those of you with folders use? Thanks!