He replaced the chain, BB and front deraileur. The old chain was very stretched but indexed fine so I assumed as it's a new chain and 'tighter' (is that right?) that this would knock the indexing out slightly.I don’t think it’ll be the chain itself. Did he replace the rear cassette? Did he replace the gear cables?
It jumps on the middle gears of the rear cassette - it seems fine on the outer gears top and bottom. And it seems to be mostly an issue when I'm in the large ring on the front. It also seems worse when I'm not pushing too hard, but jumps less when I'm putting on more pressure.
It's not a major hassle and I'm sure I'll get it right at some stage, but does mean I'm sometimes missing a gear when I'm about to attack and that's why I getted dropped (how's that for an excuse )