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If you compare new and old derailleurs, you'll see that the new ones have cages made from thinner metal, but stamped to make them torsionally rigid. Older ones like this Campagnolo FD have a nice flat low profile cage that works well with cranks that resemble the older Campy with low Q-factor and relatively straight crank arms. Of course vintage ...


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There will be only very small differences in the widths different FDs (assuming you are talking about the inside to outside dimension). One that is designed to be minimum sized so that it provides a best fit for 46t large chainrings is Shimano's CX-70, intended for cyclo-cross: ...



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