Joined: Jun 2013
Posts: 4,094
Likes: 2
From: Bozeman
Bikes: 199? Landshark Roadshark, 198? Mondonico Diamond, 1987 Panasonic DX-5000, 1987 Bianchi Limited, Univega... Chrome..., 1989 Schwinn Woodlands, Motobecane USA Record, Raleigh Tokul 2
You can get a good bike computer for $30. It's not worth it to worry about the battery in your phone or breaking your phone when you fall.
I think most cateye computers are good. I have an old cateye astrale 8 (I spelled that wrong, but you'd be able to find it fine.)