So I've been trying this grind lately and I'm not sure exactly what it's called. Basically you're rolling along next to the ledge and or rail, and you do a little nose manny then place the back peg on the ledge, slide for a bit, and then roll away. I haven't really seen many people do it but this was the first grind I learned on a two foot high home-made rail lol.
To grind, or not to grind?