Shimano Nexus SG-C3000-7R 7-Speed Internally Geared 36h Rear Roller Brake Hub Kit, Small Parts Included | Tree Fort Bikes
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Amazon.com : SHIMANO Nexus 5 Speed Roller Brake Internal Bicycle Gear Hub SG-C7000-5R in Black - 36H 135 x 187mm : Sports & Outdoors
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