Originally Posted by f1seb

If you have an Android cell phone you can skip on the GPS unit. Download an app called Tracks turn it on and it will record nearly everything.

1. Speed/Average Speed/Fastest Speed/Slowest
2. Elevation Changes
3. Distance
4. Time/Time with stops and with no stops
5. It will map your route
6. You can save and upload your results to your pc and keep "track."

That's what I do. Take my phone turn the app on, throw the phone in my back pocket and go.
But I guess if you want to see your real time speed I guess a GPS unit on handlebars is the way to go.