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●Installation requires professional knowledge Failure to do this may lead to unexpected accidents. Installation is done by a bicycle seller. Compatible with SHIMANO ULTEGRA R8100-8150Di2 series or DURA ACER 9200-9250Di2 series 3K carbon cage Full ceramic bearings 7075 aluminum pulley 14T-17T Weight: 2.6 oz (68 g) Maximum sprocket: 34T

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Description