1、CNC Machining: The bike speed tensioner is CNC finish machining, compared with simple die casting process, curved surface structure design, is more difficult to process, has higher density, is more solid and wear resistant. 2、Labor Saving: This bike speed tensioner is driven by four connecting rods, flexible in action, without interference of transmission system, and more labor saving and accurate. 3、High Strength: The bike speed tensioner looks beautiful, 10MM stainless steel hollow rod has high strength, grinding treatment and large stress area. 4、Prevent Chain Loss: Double positive and negative teeth guide wheel, Peilin structure and double side covers are added to improve the lubrication and prevent chain loss. 5、Aluminium Alloy: The bike speed tensioner replacement is made of aluminium alloy material that is compatible for P Line11 30T and for C Line11 32T flywheel. Item Type: Bike Speed Tensioner Material: Aluminium alloy Gross Weight: 429g/15.1oz Compatible with: for P Line11 30T and fpr C Line11 32T flywheel 2 x Speed Control System Assembly 2 x Screws Accessory