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Bosch System Controller (BRC3100) The smart system MFPN=05274758 Integrated notch in end cap FM1749 Integrated notch in end cap allows easier dissasembly Rear Axle 12mm Thru x 142mm Cassette Body Type Shimano HG Color Black Red Skewer Included No Bearing Type Sealed Cartridge Defined Color Black Spoke Interface Straight Pull Hub Drilling 24 Hub Brake Compatibility Center Lock Disc Utilizes Shimano synchronized shift program allowing each bar end shifter to be programmed to upshift or downshift the rear derailleur while the Di2 computer decides when to shift the front derailleur for the optimal front and rear gear combination LEDs use different colors to indicate the riding mode as well as the battery charge level in 10% increments The System Controller makes your Ebike smart – and is the interface for software updates
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