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OS20 is not 22" diameter but larger 20" diameter. The OS20 is therefore a higher and larger diameter for stiffness and velocity. It was designed to offer more speed and less rolling resistance compared to the conventional 20 "diameter.
the icons help you to choose the type of chain, some offer a higher level of quality thanks to alloys or surface treatments more resistant to wear or corrosion. Remember to check the wear of your chain: a chain too worn deteriorates the teeth of the trays and gables. Light Highest pin...