Wheel center cap with radial lock

A cap assembly for a wheel, comprising:

• a cup-shaped cap member having a plurality of annular ridges disposed around a circumference thereof;
• and
• a retainer ring having a plurality of axially extending flange portions disposed around a circumference thereof, said retainer ring slidably coupled to said cup-shaped member, said axially extending flange portions are angled relative to a position normal said ring, and said plurality of axially extending flange portions corresponding to said plurality of annular ridges,
• wherein when the cap assembly is inserted into the wheel, said retainer ring slides along said cup-shaped member and said annular ridges force said axially extending flange portions to said position normal said ring to attach said flange portions to the wheel.

A cap assembly for insertion info an aperture of a wheel defined by sidewalls of the wheel, the cap assembly comprising:

• a cup-shaped cap member having a plurality of annular ridges disposed around a circumference thereof;
• and
• a retainer ring having a plurality of axially extending flange portions disposed around a circumference thereof, said retainer ring slidably coupled to said cup-shaped member, said axially extending flange portions are angled relative to a position normal said ring, and said plurality of axially extending flange portions corresponding to said plurality of annular ridges,
• wherein when the cap assembly is inserted into the aperture, said retainer ring slides along said cup-shaped member and said annular ridges force said axially extending flange portions to said position normal said ring to attach said flange portions to the sidewalls of the aperture.