US Patent 9039023 Outer tube for front fork

In an outer tube for a front fork, a metal upper collar to which an upper vehicle body attaching bracket is connected is fitted and attached to an upper end portion of the plastic pipe, a metal sleeve is fitted and attached between an intermediate portion and a lower end portion of the plastic pipe, and the sleeve is provided with a lower collar to which a lower vehicle body attaching bracket is connected, and a seal case for inserting and supporting the inner tube.