CX70 cyclo-cross double front derailleur for use with Shimano 10-speed road STI shifters only for optimum shifting performance Light spring tension provides a feather light down shift & smooth shifter stroke Wide inner link increased rigidity & takes front shifting performance to a new level, especially under heavy load The forged wide link cradles the axle pivot at both ends providing a smooth shifting swing Optimised chain guide shape for 46-52 tooth chainrings Capacity 16T