Shimano Alivio RD-M3100-SGS 9-speed rear derailleur

The Shimano Alivio RD-M3100-SGS 9-speed rear derailleur combines performance and durability for recreational or sport-oriented mountain bikes. Its Shadow RD technology reduces the risk of snags by lowering the derailleur's profile, while simultaneously improving shifting precision and smoothness. The long cage (SGS) efficiently handles a total capacity of 45 teeth, ideal for drivetrains with a wide gear range (up to 36 teeth on the largest cog). Designed for XC or gravel riding, it ensures quiet and reliable shifting even in demanding conditions.