Shimano has Front Derailleurs available for different Chainstay Angles - 63-66 degree & 66-69 degree. For what reasons do frames use the above Chainstay Angles? It appears that SRAM only specifies Front Derailleurs for chainstay angles between 66-69 degrees. Can somebody inform me as to the significance of the difference of using different ranges of Chainstay Angles?
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