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Amazon.com : CyclingDeal Conversion Kit Fixie Bike Single Speed Compatible with Shimano Sram Cassette Freewheel Hub Adaptor - for Mountain and Road Bike Gear Cog Spacers 13 Teeth : Sports & Outdoors
Problem Solvers - Convert your fancy SRAM XD 11-Speed drive-trains into simple single-speed rigs. http://problemsolversbike.com/article/fresh-solution-zinger-xd-singlespeed- adapter-kit | Facebook
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Portable Single Speed Set Freewheel Adapter Sprocket 20T Accessories Equipment Component Bike - Red - Walmart.com
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