Is it possible to upgrade the tyre size of my Mitsubishi Lancer Fortis ?
Regarding your vehicle there is only one tyre size approved: 205 60 R16 92. (source: https://tyres.rezulteo.co.uk/car-4x4-van-tyres/mitsubishi/lancer/lancer-fortis/1.8-mivec-143)
But if you really want to upgrade it, you can have a look here: http://www.etyres.co.uk/tyre-size-calculator
The rezulteo team