Indices in tire size designation

• "R" - radial tire (radial)
• "D" - bias tire (diagonal). Frequently it is not indicated.
• "C" - light-truck tires and super small buses (commercial)
• "L" - sometimes it is indicated for lowsection tires (low)
• "T" - It indicates that it is the tire of temporary use (spare). The tire is mounted when the basic tire is broken (temporary).