Rim components are lock ring, side ring, bead seat, driver key and side flange for different kinds of rims like 3-PC, 5-PC & 7-PC OTR rims, 2-PC, 3-PC & 4-PC forklift rims. The 25″ is the mainstream size of rim components because lots of wheel loaders, haulers and dumpers are using 25″ rims. Rim components are critical for rim quality and capability. The lock ring needs to have correct elasticity to make sure it locks the rim in the meanwhile easy to demount and mount. The bead seat are critical for capability of the rim, it bears major load of the rim. Side rings are the parts connect with tire, it needs to be strong and accurate enough to protect the tire.