Bearings are what enable the gears to rotate effortlessly. They are generally produced from bronze or brass, and so they fit into races (or grooves) while in the gearbox housing. We use cookies making sure that we give you the best expertise on our Site. For more info read through https://filter-gearbox91345.livebloggs.com/40499748/the-definitive-guide-to-filter-gearbox