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Amazon.com : SHIMANO Alfine 8-Speed Internal Bicycle Gear Hub - SG-S7051-8 (Black - 32H 135X187MM) : Sports & Outdoors
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Amazon.com : Shimano Alfine SG-S7001 8-Speed Internally Geared Disc Brake 36h Rear Hub Black, Small Parts Not Included : Sports & Outdoors
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