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Amazon.com : SHIMANO FC-M640 Zee 10 Speed Crankset (175-mm, 36T with 68/73-mm Bottom Bracket) : Bike Cranksets And Accessories : Sports & Outdoors
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Amazon.com : ZEE Products Shimano FC-M640/M645 Chainring 34T : Bike Chainrings And Accessories : Sports & Outdoors
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