The BMC Dropout - No 59 is designed for 11 and 12s Direct Mount derailleurs. | SHIMANO and some CAMPAGNOLO rear derailleurs are designed to make rear wheels easier to remove. All SHIMANO Shadow RD and Shadow RD+ derailleurs will mount directly onto our "Direct Mount" frame dropout hanger. | Please note that you do not need to use the SHIM
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It is exactly what I needed, but I can’t give 5 stars to a product that is specifically designed to be proprietary, so as to keep the price high.