265/50R20 vs 285/50R20
285/50R20 is 2.6% taller (+0.79 in) and 0.79 in wider than 265/50R20.
285/50R20 is 2.6% taller than 265/50R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 285/50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 285/50R20 tires
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265/50R20 or 285/50R20?
Can I use 285/50R20 instead of 265/50R20?
285/50R20 is 2.6% taller than 265/50R20. 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 285/50R20 you are really doing 61.6 mph if the speedometer was set up for 265/50R20. Going the other way, 265/50R20 would make it read 58.5 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.39 in (+10 mm) under the axle.