I was just given a Rockhopper. The frame is decent, some of the rest of it is a little rough around the edges, a 19 inch seat tube C/C, kind of a flat, gunmetal blue color. How do I tell what year it might be? I am fairly certain most of the equipment has been swapped around over time, it has some weird twist grip shifters, did any Hoppers come that way?

Not sure what I might do with this bike, single speed it, turn it into a gravel grinder. The 19 inch frame as a ATM/MTB is a little large for me in that regard but as a gravel bike, maybe even with drop bars it might be perfect.