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3 comments
The Tiagra components are shifters, front mech and cassette. The rear mech is 105. They also do a "special edition" one with SRAM Apex throughout, which may be better?
2014 Tiagra is unlikely to be markedly worse than 2011 105, and may even be better, depending on which components you're talking about.
It's very much a case of swings and roundabouts, you gain on the swing (2014 being carbon) but lose on the roundabout with the (IMO) lower spec components.