I ride and it depends on what I am wearing as to how I carry. In warm weather I often ride with just a t-shirt as outerwear. Yes, I know that this is not the safest attire but I ride for pleasure and nothing is as good as the feeling of riding with a warm breeze on your skin. I prefer OWB normally, but the wind would push my shirt up and expose my gun, so when dressed like that I pocket carry (with a DeSantis, Remora, or Uncle Mike pocket holster depending on the gun). If I do wear a jacket that I carry OWB.
I used to use a tank bag, and keeping a firearm there is not a bad idea if you always take the bag with you when off the bike (moving it from the bag to a pocket is too awkward and exposed for my liking). But carrying a tank bag has all the problems associated with women carrying a purse, i.e., having it snatched from the chair in the restaurant, forgetting it in the restroom, etc. Pocket carry, even if that means carrying only my Ruger LCP 380 auto, is the safest and most concealable.