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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.
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.