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@Pasty_Spumante
Mrs chain slipping (and skipping a touch) in the top (largest) 2-3 sprockets of 10sp cassette. Cassette and chain replaced together (prob less than 1k dry miles) and chain length fine. Cheap (sunrace) cassette but shouldn't wear after lightish use and perfectly sound shifting etc in other 7 sprockets. What chance the b screw needs winding (inwards??) a touch? Any other ideas? Loathe to 'try' new chain cassette if all logic suggests it shouldn't be worn