265/65R18 vs 285/65R18
285/65R18 is 3.2% taller (+1.02 in) and 0.79 in wider than 265/65R18.
285/65R18 is 3.2% taller than 265/65R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 285/65R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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265/65R18 or 285/65R18?
Can I use 285/65R18 instead of 265/65R18?
285/65R18 is 3.2% taller than 265/65R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 285/65R18 you are really doing 61.9 mph if the speedometer was set up for 265/65R18. Going the other way, 265/65R18 would make it read 58.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.51 in (+13 mm) under the axle.