I only track my routes/speed through Strava on my Samsung smart phone. I don't have an adapter to attach it to my handlebars, and I'm not sure I want the large screen up there. Also, I don't even know if there are apps that show constant speed, it seems Strava and others only track average speed (but I could be wrong, I only turn it on and tuck it away).
Do people on here have regular speedometers? I see a lot of CatEye ones available on Amazon and Nashbar, but they vary in price a lot. Anything wireless would be nice, and although I'd like to track how many miles I put on the trainer, that's not really necessary since I'm not going for a specific mileage goal. I just want to have something that will show my speed when I'm riding outdoors. Any recommendations? Can I get one for like 30 bucks? Do I need anything else if I get one that can measure cadence?