you'd struggle to find diff between 6800 and 5800 .. 6870 if you can afford.
I couldn't really tell the difference in operation between 5800 105 and 9000 Dura-Ace.
I think if I wanted something 'better' than 105, I'd go Di2
@Ste_S started
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you'd struggle to find diff between 6800 and 5800 .. 6870 if you can afford.