1、Applicable Model: The chain tensioner is for Brompton Pline Tline, for Cline after modification. Please confirm whether it is consistent with the product you want before buying to avoid unnecessary return. 2、Sturdy and Reliable: The rear derailleur chain tensioner provides strong fixation for reliable durability, extending the lifespan of your chain. It also can be a great addition to enhance stability and performance. 3、Simple Adjustment: The chain stabilizer is suitable for 5 6 7 speed rear derailleurs, allowing for easy chain tension adjustments that provide smoother rides. 4、Enhanced Safety: The chain guide adjuster features a unique tension arm design that effectively stabilizes the chain and minimizes chain skipping, enhancing overall safety on the road. 5、Easy to Install: The chain converter is easy to install without the need for professional tools, giving the user the convenience of making adjustments on their own. Item Type: Rear Derailleur Chain Tensioner Material: Aluminum Alloy Guide Wheel: 8T Fitment: Fit for Brompton Pline Tline, also for Cline after modification 1 x Rear Derailleur Chain Tensioner