I was riding today and noticed that after a few pedal stroke my chain would go incredibly slack and then all of a sudden pull back. Once I finished the final forward pedal stroke I looked down to see my chain just basically drop down between my wheel and frame only to have it pull tight again a few seconds later.
What's causing this and how can I fix it?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Rear Derailleur issue