SRAM XX Front Derailuers. The low-profile XX Front Derailleur was designed from scratch specifically for 2 X 10. It’s a critical part of the XX shifting experience: the fastest front shift ever. Offered in a wide variety of clamp-mount and direct-mount options. Material: Forged AL-6061-T6 Outer Cage: Steel Inner Cage: Steel Weight: 118g (low mount) Compatibility: 34.9mm clamp size, 38.1mm clamp size Mount Options: Low Max Tooth: 15 tooth Bolts: TORX® T25