This chain adjuster can turn a multi-speed bicycle into a single-speed bicycle.<br> The spring design can be adapted to gears of various sizes to prevent the chain from slipping out of the crank.<br> This chain adjuster can turn a multi-speed bicycle into a single-speed bicycle, ensuring the perfect tension of the chain, allowing you to pedal more easily<br> This transmission pulley guide is light and small, easy to install and use<br> This single-speed bicycle adjuster is suitable for folding bicycles with 11T or 13T rear derailleur. It is a great accessory for cycling enthusiasts<br> Product<br> Bicycle chain tensioner folding bicycle single speed converter bicycle rear derailleur chain guide speed regulator accessory<br> :<br> This chain adjuster can turn a multi-speed bicycle into a single-speed bicycle.<br> The spring design can be adapted to gears of various sizes to prevent the chain from slipping out of the crank.<br> This chain adjuster can turn a multi-speed bicycle into a single-speed bicycle, ensuring the perfect tension of the chain, allowing you to pedal more easily.<br> This derailleur pulley guide is light and small, easy to install and use.<br> This single-speed bicycle adjuster is suitable for folding bicycles with 11T or 13T rear derailleur. It is a great accessory for cycling enthusiasts.<br> Specification:<br> Material: Aluminum Alloy<br> Color: black and red<br> Accessories: suitable for folding bicycles with 11T or 13T rear derailleur<br> Weight: about 63 grams<br> Packing list:<br> 1 x chain adjuster