BLB SINGLE SPEED CHAIN TENSIONER. Brick Lane Bikes: The Official Website
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CyclingDeal - Chain Width 1/8" Only - Fits Single Speed Chains - Bike Bicycle Aluminum Chain Tensioner for Fixie Road Bike and MTB : Amazon.co.uk: Sports & Outdoors
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How do I fit this pair of chain tensioners on my single speed bike? - Bicycles Stack Exchange