Feature: 1. CNC Machining: Exquisite workmanship, full CNC accurate machining, anode color, laser engraving sign, suitable for single speed folding bicycles. 2. Bearing Shaft: The Bike chain tensioner uses a bearing shaft, which can be matched with a variety of guide wheels. The guide wheels generally use 11 teeth, and can also use 13 teeth. 3. Aluminum Alloy Material: Bicycle tensioner is made of high quality aluminum alloy material, which is hard, stable, durable and can be used for a long time. 4. Prevent Falling Off: Folding bicycle chain stabilizer can effectively prevent the chain from falling off due to instability during riding. 5. Easy to Install: Exquisite workmanship, stylish and generous appearance, stable workmanship, easy to install and disassemble, simple operation. Specification: Item Type: Single Speed Converter Material: Aluminum Alloy Advantages: Exquisite workmanship, full CNC accurate machining, anode color, laser engraving sign, bearing shaft, can be matched with a variety of guide wheels, the guide wheel generally uses 11 teeth, but also can use 13 teeth Purpose: Single Speed Folding Bike. Package List: 1 x Single Speed Converter