235/65R18 vs 265/65R18
265/65R18 is 5.1% taller (+1.54 in) and 1.18 in wider than 235/65R18.
265/65R18 is 5.1% taller than 235/65R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 265/65R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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235/65R18 or 265/65R18?
Can I use 265/65R18 instead of 235/65R18?
265/65R18 is 5.1% taller than 235/65R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 265/65R18 you are really doing 63.1 mph if the speedometer was set up for 235/65R18. Going the other way, 235/65R18 would make it read 57.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.77 in (+20 mm) under the axle.