Currently I’m due for new tires on my 2021 ascent Premium and it currently have from stock 245/60r18 continental tires that I drove at 26,352 mileage. I’m from south Florida. Don’t want to get the same tire since it doesn’t seem to last long. I am looking at Yokohama Geolanders but noticed they sale them at a larger size. How much bigger can I go with the original rims? For example 265/60r18 or 265/55r18? Any suggestions?
I don’t think the sizes you list will fit. Maybe 255/65. Look at Discount Tire; they list alternate sizes that fit.
But just going to a larger tire won’t necessarily give you longer tread life. And could have unintended consequences.
Stock tires typically ride soft and cushy, but don’t have great tread wear. Going to a higher quality tire might accomplish your objective. I believe both the Michelin Defender LTX and Continental Terraincontact HT come in your size and should last quite a bit longer.
Cheers!
Why do you want bigger tires?
The 265mm tire is .787 inches (or just under 4/5 inches) wider than the 245's, or just under 2/5 inch wider on each side from midline (center of the tire tread). If that width difference fits the wheel well including the up and down travel distance of the shocks/struts, you should be okay.
The 245/60 has a profile height of 147mm (5.787 inches) while the 265/55 has a profile height of 145.75mm (5.738 inches). A decrease of 1.25 mm or .05 inches in radius which would result in a .31 inch decrease in tire circumference. So at 60mph using the 245/60 tires, the speedometer would be reading 59.81mph using the 265/55's. Not much of a difference.
But, I have been up for the past 19 hours today so you might want to check my computations. 😉
Additionally, your local tire store should be able to provide information regarding alternative tire sizes to fit your vehicle.