Shimano Alivio M3100 Rear Derailleur 9-Speed (Shadow, SGS Long Cage)

Upgrade a 9-speed drivetrain with the Shimano Alivio M3100 rear derailleur. The Shadow low-profile design helps keep it tucked away from trail-side knocks, while the wide link construction boosts rigidity for crisp, consistent shifting. Key features - 9-speed compatibility: works with Shimano 9-speed Hyperglide sprockets - Shadow design: super low-profile shape with a smooth skid-plate surface - SGS long cage: supports wider gearing range (total capacity 45T) - 11-tooth pulleys: helps reduce pulley wear and chain noise - Light action pivots: low-friction, fluorine-coated link pivot bushings - Durable and lightweight: alloy body and outer link Setup notes - Designed for low rear sprockets in the 32T to 36T range - Top-normal swing design Ideal for riders who want reliable, great-value shifting for commuting, leisure riding, or light off-road use.