The Shimano Deore RD-M5120-SGS is a versatile rear derailleur designed for 10- and 11-speed mountain bike drivetrains. Its long SGS cage accommodates large cassettes, supporting up to a 46T cog in 1×10-speed setups and 42T in 2×10/11-speed configurations. Equipped with Shimano’s technology, it features a low-profile design that enhances clearance and minimizes the risk of damage from rocks and debris. The integrated clutch, that reduces chain slap and drop, ensuring quieter and more stable shifting performance on rough terrain.