Description: 【Bike Single Speed Conversion Set】There are 5  base gaskets, 1 flywheel cover, 1 16T flywheel, 1 chain tensioner, 2 wrenches and 1 torque adjuster in package. 【Premium Material】Bike Single Speed Conversion Set is made from durable aluminum alloy and stainless steel material, great for outdoor riding and biking. 【Torque Adjuster】Bike Torque Regulator features stronger tension, making it suitable for slightly longer or shorter chains. 【Compatibility】This flywheel is speed of 7-11 cassette flywheel towers. Please choose a 7-11 chain for installation. Note that the side width of the 15T-22T is consistently 11.8mm. 【Installation Tips】The angle between the chain tensioner and the rear lower fork frame should be less than or equal to degrees of 45 to maximize the tension to ensure normal operation of the flywheel without slipping gears. Specification: Material: Aluminum Alloy Stainless Steel Size Chart: Chain Tensioner 9.83cmx7.62cmx2.66cmx1.6cm/3.87inchx3.00inchx1.05inchx0.63inch Package Includes: 5  Base Gaskets 1 Flywheel Cover 1 16T Flywheel 1 Chain Tensioner 2 Wrenches 1 Torque Adjuster Note: Please allow slightly errors due to manual measurement and different monitors.