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rear mech

SRAM Rival mid cage rear derailleur

Shimano Dura-Ace rear mech

Price:

£129.99

Gallery Image Reference:

Shimano Dura Ace rear mech close-up 2

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.