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umop3pisdn
Rear derailleur issues. When I'm in the big ring, shifting at the rear is fine, however when in the small ring, the chain slips when in gears 4-10 (i.e. its fine in the three largest sprockets), which isn't great as I'm in Yorkshire at the moment...
Chain and cassette replaced for new at the same time 2 weeks ago.
What the likely diagnosis here? B-Screw?