tyres worn?

[mackab24]

can anyone tell me the cause of my car tyres balding on the inside of the rim please?

[emeritus]

Your tracking is probably out - Not too expensive to correct

[NORMANTHEDOG]

tracking out,tyres wrongly under or over inflated,not balanced properly.

[woodchopper]

Also worn supension parts giving more negative camber than its supposed to have.

[rojam]

The first and third answers seem the more logical.
Under inflation would cause the tyres to be worn on inner and outer edges, over inflation would cause the tyres to be worn in the middle of the tread.
Not balanced properly would cause negligible wear on an inner edge.