Tire Size Box

285/75R16 vs 285/80R16

285/80R16 compared with 285/75R16

+3.4% diameter, 0.0" width

285/80R16 is 33.95" tall vs 32.83". More than the 3% rule of thumb, so check carefully before switching.

32.8"16" rim8.4"11.2" wide
285/75R16 (solid) compared with 285/80R16 (dashed outline), drawn to scale

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

62.1 mph

285/80R16 is +1.12 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/75R16285/80R16Difference%
Overall diameter32.83"33.95"+1.12"+3.4%
Section width11.22"11.22"0.00"0.0%
Sidewall height8.42"8.98"+0.56"+6.7%
Circumference103.14"106.67"+3.53"+3.4%
Revolutions per mile614.3594.0−20.3−3.3%

Speedometer difference

If your vehicle came with 285/75R16 and you fit 285/80R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.4 mph+1.4 mph
50 mph51.7 mph+1.7 mph
60 mph62.1 mph+2.1 mph
65 mph67.2 mph+2.2 mph
70 mph72.4 mph+2.4 mph
75 mph77.6 mph+2.6 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 285/75R16 or 285/80R16?
285/80R16 is taller by 1.12 inches (33.95" vs 32.83"). 285/75R16 is the same width.
Can I replace 285/75R16 with 285/80R16?
It is not recommended without checking carefully. The diameter difference is +3.4%, 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 285/75R16), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.4%.
Will 285/80R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

Other comparisons