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You can always buy a nicer cassette later on. Tiagra are loose cassettes with spacers riveted together, 105 upwards has alloy carriers that work better with alloy freehub bodies.
Tiagra chainsets aren't hollow forged, 105 are. Instead they have a big scallop out of the back side, that's the big difference.
hamrack
Yeah I'll be swapping out the brakes for canti's anyway so that's fine.
Chainset weight and cassette I think I can live with for the price saving if that's the worst of it!