A little more information
Vw Amarok Tyre sizing is as follows
245/70 R16 tyres. D 749mm
245/65 R17 tyres. D 749mm
255/60 R18 tyres. D 762mm
255/50 R20 tyres. D 762mm
Mine were fitted from the dealer with Pirelli scorpions
255/60 R 18 tyres. D 772mm or 30.4”
As I understand the rules I can increase my Tyre size by 25mm in either direction, so I could go to 280mm wide and a diameter of 797mm
Giving me choices of the original size 255/60 R18 D 762 $300+
Or
265/60 R18 D 775 $250+
275/60 R18 D 787 $350+ low available
285/60 R18 D 800 $290+
255/65 R18 D 790 not available in good brand
265/65 R18 D 803 $300+
All of those tyre sizes should make a few vehicles and models needs
Of course these are ball park prices with out any bulk leverage or brand choices.
Lloyd
Sent from me