• new chain and cassette fitted and gears setup by bike shop but when I stand up out of the saddle in the little ring, the chain is 'slipping' when I push down with force

    this is both annoying and potentially dangerous (have already bruised my knee, banging it into the bars when the chain slipped on a steep hill)

    how do I stop this happening? do the chain and cassette wear into each other? adjust the b-screw?

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