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2.5mm wider, which doesn't seem that much. My Dad wants lower ratios so these seem a good option, but hes on 6800 which might be worse
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I'm going to assume that on most frames that isn't going to be an issue, it's just Shimano trying to get you to buy a new mech if you do swap. The the action of the front mech is pretty coarse compared to the rear, and can operate perfectly with less accuracy.
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I juuuuuuuuuuuust about managed to get a Claris road mech working with an XT double chainset, so I reckon you'll probably be OK with GRX.
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@velosaurus
I thought I read Shimano say the GRX 2 x 11 cranks need to use the GRX front mech because of the 3mm (?) wider chainline. Anyone used a GRX crank with a normal R7000 front mech please?