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CX70 cyclo-cross double front derailleur for use with Shimano 10-speed road STI shifters only for optimum shifting performanceLight spring tension provides a feather light down shift and smooth shifter strokeWide inner link increased rigidity and takes front shifting performance to a new level, especially under heavy loadThe forged wide link cradles the axle pivot at both ends providing a smooth shifting swingOptimised chain guide shape for 46-52 tooth chainringsCapacity 16T