I'm sort of a newb when it come to cycling only having been doing it for fitness the last 4yrs or so. Anyway I'm trying to find out if there is a perfect gear, like I've heard a 42-20 is a sweetspot. The reason why I'm asking is caused I was gonna get a tattoo of the big ring on my right calve and the small ring on my left calve, like looking at the drive side of the bike. Did I open up a can o worms or?