TRP, G-Spec TR12 SL-M850, Rear Derailleur, Speed: 12, Cage: Long, Black FREE shipping within United States over $50.00 Buy Online or Click & Collect Share Loading Facebook Like button... TRP, G-Spec TR12 SL-M850, Rear Derailleur, Speed: 12, Cage: Long, Black FREE shipping within United States over $50.00 Buy Online or Click & Collect Share Loading Facebook Like button...