What equivalent rims or wheels can I use on a ford focus 1.8 saloon 1999-2005?

Hi would like to know what equivalent wheels or rims I can use on my ford focus and what max diameter I can go with I currently have factory standard fitted and they are 4 bolt.

Why "equivalent" wheels? Why not just find a nice set of alloys from an aftermarket wheel supplier. They will give you advice on safe widths, tyre sizes etc. Don't forget to inform your insurance company.

Ignore the advice from Bearface, its's complete bull5hit.