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Surely likewise there is still a difference between Sora and Tiagra apart from the extra cog on the cassette?
There is, different material use in the shifters mechanism, like the difference in shifting between 105 and Ultegra.
Only problem is that the cable pull will be different, gonna put the new Sora derailleur on the new Tiagra to see if there's any difference.
105, Ultegra and Dura-Ace are all 11 speed. Surely likewise there is still a difference between Sora and Tiagra apart from the extra cog on the cassette?