This Shimano Tourney 7/8 Speed Rear Derailleur has a double servo-pantograph technology that improves adjustability and resists weather and contamination. The guide pulley tracks the cogs closely while moving front to back, optimizing each shift. It has a shorter derailleur Smart Cage that grants you MegaRange capability with the shorter cage. Key Features: - It is made for 8-speed drive trains- It fits 34T max- It has a standard mount- It has quick assembly- It has double servo-pantograph technology

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