Thanks!
That does look extremely close from the pics to have 285/35/19. I've used a tire size calculator (http://www.kouki.co.uk/Utilities/tyresizer.asp) and it says:
285/35/18
Rolling Radius: 206.31cm
Total Diameter: 65.67 cm
Sidewall Height: 9.98cm
285/35/19
Rolling Radius: 214.29cm
Total Diameter: 68.21 cm
Sidewall Height: 9.97cm
So that's an extra 2.54cm or exactly an 1inch in height. But if I go for the 30 then it's:
285/30/19
Rolling Radius: 205.33cm
Total Diameter: 65.36 cm
Sidewall Height: 8.55cm
What does the sidewall figure give exactly?