265/70R17 vs 285/70R17

285/70R17 is 1.1" taller than 265/70R17 (3.5%)

Diameter difference+3.49%diameter 31.61" → 32.71"
265/70R17285/70R17
265/70R17285/70R17Difference
Overall diameter31.61"32.71"+1.10"
Section width10.43"11.22"+0.79"
Sidewall height7.30"7.85"+0.55"
Circumference99.3"102.8"+3.5"
Revolutions per mile638617−22
Wheel diameter17"17"±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

285/70R17 is 1.10" taller than 265/70R17, a +3.49% 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.

285/70R17 is 0.79" wider. On the same wheel offset about half of that, 0.39", moves toward the suspension and half toward the fender.

Both fit a 17" wheel; the sidewall is 0.55" taller on 285/70R17.

Details: 265/70R17 in inches · 285/70R17 in inches · change sizes in the calculator

FAQ

What is the difference between 265/70R17 and 285/70R17?

285/70R17 is 1.10" taller (+3.49%) and 0.79" wider than 265/70R17.

Will 285/70R17 change my speedometer?

Yes, by +3.49%. When the speedometer shows 60 mph you would be going 62.1 mph.

Can I replace 265/70R17 with 285/70R17?

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