What are cartridge bearings?

<p style="text-align: center;"><img src="/ueditor/php/upload/image/20221222/1671698399407812.png" title="1671698399407812.png" alt="3.png"/></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">Cartridge bearings are an evolution of cup-and-cone bearings, where the <a href="https://www.wswbearings.com/products/ball-bearings/534.html" target="_blank" style="color: rgb(0, 112, 192); text-decoration: underline;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px; color: rgb(0, 112, 192);"><strong>ball bearings</strong></span></a> sit inside a sealed unit rather than directly against the hub internals.</span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;"><br/></span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">Like cup and cone bearings, the ball bearings in a cartridge unit will usually sit inside a cage to maintain equal spacing and will be packed with grease.</span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;"><br/></span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">Cartridge bearings will feature an inner and outer race – equivalent to the cup and the cone – and a rubber seal on the inner and outer faces.</span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;"><br/></span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">These sealed units are designed to fit tightly inside the hub to prevent the whole cartridge from moving rather than just the internal loose bearings and, as such, should ideally be pressed in with a bearing kit to prevent damage.</span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;"><br/></span></p><p style="text-align: justify;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">Cartridge bearings are not adjustable and are replaced as a complete unit when they wear out.</span></p><p><br/></p>