I have 20 inch rims on my 2015 Colorado7. I've been trying to source a pair of 275/45R20 tyres to replace damaged tyres on the rear but have only been able to source 265/50R20. These would have a 16mm (1%) greater circumference than the 275/ This wouldnt matter in two wheel drive. But will it matter in 4wd? I'm only in 4wd occassionally when on rough or sandy ground.