Tire Size Box

295/80R16 vs 285/85R16

285/85R16 compared with 295/80R16

+1.4% diameter, −0.4" width

285/85R16 is 35.07" tall vs 34.58". Within the 3% rule, so usually interchangeable.

34.6"16" rim9.3"11.6" wide
295/80R16 (solid) compared with 285/85R16 (dashed outline), drawn to scale

With 285/85R16 tires, when your speedometer says 60 mph you are really going

60.9 mph

285/85R16 is +0.49 inches (+1.4%) in overall diameter. That is within the 3% most shops and makers allow.

295/80R16285/85R16Difference%
Overall diameter34.58"35.07"+0.49"+1.4%
Section width11.61"11.22"−0.39"−3.4%
Sidewall height9.29"9.54"+0.25"+2.6%
Circumference108.64"110.19"+1.55"+1.4%
Revolutions per mile583.2575.0−8.2−1.4%

Speedometer difference

If your vehicle came with 295/80R16 and you fit 285/85R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.3 mph+0.3 mph
30 mph30.4 mph+0.4 mph
40 mph40.6 mph+0.6 mph
50 mph50.7 mph+0.7 mph
60 mph60.9 mph+0.9 mph
65 mph65.9 mph+0.9 mph
70 mph71.0 mph+1.0 mph
75 mph76.1 mph+1.1 mph
80 mph81.1 mph+1.1 mph

Each size on its own

Questions

Which is bigger, 295/80R16 or 285/85R16?
285/85R16 is taller by 0.49 inches (35.07" vs 34.58"). 295/80R16 is wider by 0.39 inches.
Can I replace 295/80R16 with 285/85R16?
Usually, yes. The diameter difference is +1.4%, inside the 3% rule of thumb most tire shops use. Check that the wider or taller tire clears your suspension and fenders, and that its load index meets your placard.
How much will 285/85R16 change my speedometer?
When your speedometer reads 60 mph with 285/85R16 fitted (calibrated for 295/80R16), your real speed is 60.9 mph. Your odometer will under-count miles by about 1.4%.
Will 285/85R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.25 inches of ground clearance at the axle.

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