• You can put a wider cassette on your current 6800 if its the 11-30 you are talking about.

    Di2 buttons on top the shifters

    Yes but I've heard that the blutooth drains battery, quoting @danstuff or @Dammit (not sure who said it).

    the brakes

    Yes but you can always get the brakes on the current gears ;)

    As a #buyer I feel your urge but R8050 and 6870 is the least worthy upgrade. 6800 to R8000 yes!

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