Core assembly for pneumatic tire

A core assembly for a pneumatic tire, which is assembled into an annular configuration by connecting opposite ends of two or more arcuate members, capable of being fitted annularly to with an outer peripheral surface of a well portion of a rim with said pneumatic tire mounted thereon, and is adapted to rotate as an outer surface of said core assembly comes into contact with an inner peripheral surface of a crown portion of said pneumatic tire and an inner peripheral surface of said core assembly slides over said outer peripheral surface of said well portion of said rim if said pneumatic tire collapses owing to a decline in internal pressure thereof, the core assembly further comprising:

• a sliding portion encompassing at least a portion of said inner peripheral surface of said core assembly and formed of a resin material having a good sliding property and a high heat resistance, said sliding portion being capable of sliding over said outer peripheral surface of said well portion;
• and
• the entire remaining portion, excluding said sliding portion, formed of a light metal material having a high rigidity and a low specific gravity.