Tenaci Modular Flywheel BMW/Toyota B58 Tenaci's modular flywheel comes with an exchangeable backplate, this means you can choose between 184mm, 200mm, and 240mm clutches . One of the great advantages of having a replaceable backplate is that once the surface is damaged or worn, you only buy the backplate, and use the same flywheel again. 184mm/200mm Flywheels also offers a " 3-stage stepdown" , which means that you have the option of adjusting when the discs have become worn, and can mount the clutch at a shorter distance from the wear surface of the backplate. Backplate included, select size in the drop-down menu