• Yeah, cassette is probably fine if it's the first chain it's seen, although it is time for a new chain if you want to not need a new cassette soon, if it was a chain wear issue it'd likely be at the other end of the cassette. Check the hanger properly, make sure you've got enough cable tension, check the limit screws and especially b-adjust in case they weren't quite right, check the jockey wheels and whole mech for play (the cheap SRAM MTB ones are awful for having so much play from new that setting them up is impossible, but rival should be fine) then look at cables, then get shimano anyway.

  • Yeah jockey wheel play is a pain on cheap mechs. I was once fixing up a cheap old MTB while in Africa with no access to spares. Terrible shifting. So I made a washer out of very thin plastic (takeaway food pot) to shim out the internals of the upper jockey wheel, reducing sideways play to very little. Huge improvement! No idea if it would last years, but something else on that bike will probably die first.

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