Mini bike torque converter sprockets help get the most optimized performance even in tough riding conditions. Check out the high-end sprockets at OMB Warehouse. A torque converter acts like your transmission, allowing higher speeds of your small engine and smoother acceleration. Our mini bike torque converter sprockets are perfect for lower end torque as they can adjust the gear ratio depending on the RPM of the engine. The four top selling mini bike torque converter sprockets in our inventory are as follows. First is the 1. 8 Tooth, 5/8" Bore, Integral 3/16" key, C Sprocket, 40/41/420 Chain for torque converters and jackshafts. C Type sprockets have a hub on both sides and no set screws. The second is the 12 Tooth 40 41 420 Chain 5/8" Bore "C" Type Sprocket for torque converters and jackshafts. It is made with case-hardened steel and hobbed teeth. The third is the 9 Tooth, 5/8" Bore, C Sprocket for 40/41/420 Chain 9 without Keystock for torque converters and jackshafts. C Type sprockets have a hub on both sides. Keyway is 3/16". Lastly, there is the Torque Converter Sprocket, 15 Tooth, #35 Chain, 5/8" bore commonly used on torque converters. C-type sprockets have a hub on both sides and no set screw. This has a 3/16" keyway.