I have an 02 Audi A4 TDI130 (B6)

Currently the car has 195/65R15 tyres fitted all round (Dunlop SP fastresponse)

I need new tyres so looked up online. If I input my reg number to find tyres I get two size options for my car:

205/60W15 and 215/55W16

However the 15" size doesn't match what is fitted on the car

Do I have the wrong size tyres on the car or are the results for my model wrong??