The Shimano Deore RD-M6200 rear derailleur is based around the traditional clutch-style chain stabilizer; it weighs just 360 grams and is the most affordable 12-speed Shimano derailleur available. It features a steel pulley cage and HYPERGLIDE+ for fast shifting, even under load. Shadow RD+ traditional clutch-style chain stabilizer reduces chain slap for a quiet ride and efficient shifts Because of its low profile and single tension construction, the derailleur doesn't hit the chain stay in rough riding conditions Steel pulley cage adds extra strength and durability to the design Long Cage is compatible with all HG+ 10-51t 12-speed cassettes (sold separately) Requires HG 12-speed compatible chain (sold separately)