I have said this before so sorry if it bores you.

Stoker wanted a computer. We were waiting for a ferry in Stockholm and had a couple of hours. Answer is get your self a cat eye. Put magnet on rear wheel run cable up to top tube mount cat eye aero bar adapter on top tube and away you go.

Looks a bit vonerable but has been ther for a good while with no problem. When I fly the bike I just loosen it a bit an place in line with the top tube for protection.

Ok dosent look that prity but hey, bueauti is as buety does.

Cheers