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Hey /n/. Total bike newbie here. Got some problem with my Trek's shifters. When shifting speeds sometimes it feels like it doesn't fully engage the crank or something, and sometimes it CLANKs a bit after a few dozen cycles, as if seating properly finally. Then yesterday the chain didn't change from one sprocket to the other mid-shift and I couldn't pedal. And tonight, the chain completely shifted off the smallest sprocket and onto the frame of the bike. Had to reseat it back to get it to work, which is easy, but I feel my bike shouldn't be doing that. Then, while checking what happened, I shined a light, and there's all these nasty scratches on the frame. I got the bike used so ot already had some wear on it, but I swear it didn't have all these before. Kinda worried I'll get hurt, or worse, damage the bike any further.
Any ideas on what's going on? Also, is that normal wear? Should I try fixing it/cover it/touch it up? I know it's just cosmetic, but I'm autistic about those things.
