Chain idler 100 mm with carrierring and o-rings (Alligt)

Chain idler 100 mm with carrierring and o-rings. This size is used in mostly usewd in Hp Velotechnik recumbents and trikes. Can be used in the pulling and return chain side. In the middle of the idler is a carrier ring that supports the chain. On both sides of this ring is a O-ring for a more silent running. It has 2 bearing with an inside diameter of 8 mm.