JT Sprockets - Front SteelJT Front Sprockets are manufactured using only the finest grade of SCM420 chromoly steel alloy. The heart of JT Sprockets and their durability, is the material used and the accuracy of the machining process. Every JT sprocket is made the right way, by hobbing, machining and drilling. This is the only way to achieve the closest tolerances and the best tooth profiles. And every sprocket goes through 10 individual quality control checks before it leaves