• was hard pressed to find a difference between the mechanical R8000 & GRX front mechs.
    Pulled out the vernier (with battery but sans cap of course) and measured.
    The cage shape is a tad different, everything else was the same.
    My conclusion? R8000 mechanical front mech can handle it all, GRX is braze on only and thus may need clamp = more cash for no reason.

  • It's right at the limit, just shifts far enough to get into the big ring and not rub, limit screw (or whatever it is) is all the way in.

  • When I bought the GRX crank I included the front mech + clamp.
    Turned out the R8000 mech worked just fine.
    The GRX + clamp was an extra €20 over the R8000.

    Surely there is sound technical reason Shimano states the R7000 & 8000 are incompatible.
    Maybe we just got lucky with our bikes?
    Kudos to Shimano mechs for being so forgiving.

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