Tire Size Box

265/80R16 vs 285/80R16

285/80R16 compared with 265/80R16

+3.9% diameter, +0.8" width

285/80R16 is 33.95" tall vs 32.69". More than the 3% rule of thumb, so check carefully before switching.

32.7"16" rim8.3"10.4" wide
265/80R16 (solid) compared with 285/80R16 (dashed outline), drawn to scale

With 285/80R16 tires, when your speedometer says 60 mph you are really going

62.3 mph

285/80R16 is +1.26 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/80R16285/80R16Difference%
Overall diameter32.69"33.95"+1.26"+3.9%
Section width10.43"11.22"+0.79"+7.5%
Sidewall height8.35"8.98"+0.63"+7.5%
Circumference102.71"106.67"+3.96"+3.9%
Revolutions per mile616.9594.0−22.9−3.7%

Speedometer difference

If your vehicle came with 265/80R16 and you fit 285/80R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 265/80R16 or 285/80R16?
285/80R16 is taller by 1.26 inches (33.95" vs 32.69"). 285/80R16 is wider by 0.79 inches.
Can I replace 265/80R16 with 285/80R16?
It is not recommended without checking carefully. The diameter difference is +3.9%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 285/80R16 change my speedometer?
When your speedometer reads 60 mph with 285/80R16 fitted (calibrated for 265/80R16), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.9%.
Will 285/80R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.63 inches of ground clearance at the axle.

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