Shimano Acera RDM3020 SGS 78spd Rear MTB Derailleur delivers smooth and precise shifting for 7 and 8speed drivetrains Double Servo construction ensures consistent gear changes under load while the widerange capability accommodates a low sprocket up to 40T and a total capacity of 45T The derailleur provides reliable performance across various MTB setups helping riders maintain control and efficiency on every rideFeatures Double Servo construction for smooth and precise shifting Versatile performance and wide compatibility Max low sprocket 40T Total capacity 45T

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