• If you really want to use that hub, you could probably get the 105 rear derailleur to shift over the new HG800 11-34 Shimano cassette. It will fit on an HG freehub body. The derailleur doesn't officially support the 34T cog, however there are tons of videos of people setting up much more crazy combos with the 105 group.

  • My Canyon Ibflite with 5800 and a HG800 11-34 works fine. Derailleur is close to the cassette but not had any problems so far

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