This cool little video explains to budding techies how the use of radial ball bearings & specifically the steel balls inside them can decrease friction and increase efficiency in a bearing, allowing a wheel, or other spinning component, to spin freely.
If you'd like to see more technical information on bearings, please visit our website's technical pages, which are jam-packed with useful information on a range of topics & includes advice on material selection, bearing fit, lubrication & much more...