Bearings are what allow the gears to rotate smoothly. They are generally created outside of bronze or brass, and so they in shape into races (or grooves) within the gearbox housing. Examine more What on earth is a Toroidal Transmission Nowadays Extroid CVTs are generally often known as “toroidal” as https://filter-gearbox37913.ttblogs.com/13760758/5-simple-statements-about-filter-gearbox-explained