exact front rim specs for a 2004 bulldog?

[fantomaz]

I am looking for the exact specs for the front rim of my 2004 bulldog, I know it is 21' and that it was made by performance machine and intended for a120/70 tyre. The original avon or metzeler tyres are no longer available being replaced by newer, slightly different profiles.

Can anyone help?

Thanks in advance!