The low-profile XX Front Derailleur was designed from scratch specifically for 2x10. A critical part of the XX shifting experience that delivers the fastest front shift ever. Offered in a wide variety of clamp-mount and direct-mount options. High Mount Low Mount and Direct Mount. Made of forged 6061-T6 aluminum B-Knuckle for stiffness and reinforced carbon composite coupled with advanced engineering make these products lighter stiffer and smoother. 31.8mm 34.9mm and Direct Mount clamp sizes. Low mount 118 grams. Black and silver.