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Bros, I feel my chain skipping over teeth when I'm pedaling hard on the smallest cog of the cassette
Context: I just got my bike back from the workshop, I took it there to install a new crankset and front derailleur and the dude also added a few chain links, since I went from single chainring to double chainring. I can't bring it back now because it's Saturday and he's closed already, so I wanna know if there's anything I can do instead of waiting for Monday
Cog and chain shouldn't be worn out already, I bought the bike earlier this year and I pedaled 1300km in total, it didn't have this issue before anyway