Howdy. My dad (74 year old) has a single speed POS bike (something I built from my old parts). He wants something to hold it up so he can pedal when it's raining (lives in Oregon = always rains). He's not training for a race/marathon/contest/etc, he just needs light exercise. I know nothing about these things except for the high end ones my roadie friends have... He'd like to spend around 50-60bucks, I think. Thoughts, suggestions, bacon? thanks.