235/85R16 vs 285/75R16

285/75R16 is 1.1" taller than 235/85R16 (3.5%)

Diameter difference+3.47%diameter 31.73" → 32.83"
235/85R16285/75R16
235/85R16285/75R16Difference
Overall diameter31.73"32.83"+1.10"
Section width9.25"11.22"+1.97"
Sidewall height7.86"8.42"+0.55"
Circumference99.7"103.1"+3.5"
Revolutions per mile636614−21
Wheel diameter16"16"±0"

Speedometer

ShowsActualDiff
30 mph31.0 mph+1.0
45 mph46.6 mph+1.6
60 mph62.1 mph+2.1
70 mph72.4 mph+2.4
80 mph82.8 mph+2.8

Gear ratio to match

CurrentEquivalent
3.423.54
3.553.67
3.733.86
4.104.24

285/75R16 is 1.10" taller than 235/85R16, a +3.47% change in diameter. That is more than the 3% many tire shops use as a limit, so plan on recalibrating the speedometer and checking ABS and stability control.

Ground clearance changes by 0.55" (half the diameter change), and the tire needs 0.55" more room above it.

285/75R16 is 1.97" wider. On the same wheel offset about half of that, 0.98", moves toward the suspension and half toward the fender.

Both fit a 16" wheel; the sidewall is 0.55" taller on 285/75R16.

Details: 235/85R16 in inches · 285/75R16 in inches · change sizes in the calculator

FAQ

What is the difference between 235/85R16 and 285/75R16?

285/75R16 is 1.10" taller (+3.47%) and 1.97" wider than 235/85R16.

Will 285/75R16 change my speedometer?

Yes, by +3.47%. When the speedometer shows 60 mph you would be going 62.1 mph.

Can I replace 235/85R16 with 285/75R16?

It is a +3.5% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.