Klaatu Barata Niktu
I just got a new bike, used, and went on one of my favorite rides. I noticed after riding a little gulch-ish section with a lot of roots, whenever I coast, which i do a lot, my chain gets a large amount of slack. i also noticed that my rear derailleur is reaching very far forward. I then have to pedal very hard to pick up all of the slack. Is there any part I can get to fix this? do i have to get a new drivetrain, or should i take it to my bike store?