There are a couple of big changes out back. First, you get a carbon pulley plate that brings down the weight (16g overall). Second, the new rear mech is compatible with cassettes up to 28T. The total capacity (the tooth difference between the two chainrings plus the tooth difference between the biggest and smallest sprockets) is now 33T – so you’re unlikely to feel the need for a triple. Once set up and bedded in, we had no troubles at all with shifting either up or down the cassette – all very precise and very definite in both directions with no need for any tweaking during the test period. What more can you ask for?