285/65R18 vs 265/70R18
265/70R18 is 0.1% taller (+0.02 in) and 0.79 in narrower than 285/65R18.
265/70R18 is 0.1% taller than 285/65R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 265/70R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 265/70R18 tires
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285/65R18 or 265/70R18?
Can I use 265/70R18 instead of 285/65R18?
265/70R18 is 0.1% taller than 285/65R18. That is inside the ±3% most shops treat as a straight swap. 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 265/70R18 you are really doing 60.0 mph if the speedometer was set up for 285/65R18. Going the other way, 285/65R18 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.01 in (+0 mm) under the axle.