18s v 20s is far less important than correct tire pressure which many of these numbnuts are clueless about. This comes from a 3x range Rover guy and a Westminster with summer 22s v winter 20s.........I see WAAAAYYY too much BS on this forum from people thinking this is a luxury SUV........maybe to them it is but in reality, its NOT!!!!!
After a single digits ride home last Sarudaay night before the noreaster with snows set for 20 degrees when it was actually 0-10 tops, I can say even those 2 psi made a serious difference. I hear all this E load, oversized this, 10 ply that, 40 psi works for me, yada,yada, yada......offroading v onroading are different animals at 80mph! THe seats on my LC fit my body better than the Westminster (HSE) seats on my last 2 Range Rovers....talk about overachieving! Will it ride like one....NO!