Funny thing, Tom. Yes, I have. I even paid for an app on my iPhone.

Funny thing is, I can't make heads nor tails of it: speed I get, the ratio, I don't. I mostly use it to find out which gear combos are redundant (numbers match up, bad. Numbers go up slightly, might be redundant.) and how to gear up my single speed winter bike.

All I know is that a standard is going to be harder for me to pedal. I just want to feel by how much.