235/85R16 vs 245/75R16

235/85R16 is 1.3" taller than 245/75R16 (4.0%)

Diameter difference−3.97%diameter 31.73" → 30.47"
235/85R16245/75R16
235/85R16245/75R16Difference
Overall diameter31.73"30.47"−1.26"
Section width9.25"9.65"+0.39"
Sidewall height7.86"7.23"−0.63"
Circumference99.7"95.7"−4.0"
Revolutions per mile636662+26
Wheel diameter16"16"±0"

Speedometer

ShowsActualDiff
30 mph28.8 mph−1.2
45 mph43.2 mph−1.8
60 mph57.6 mph−2.4
70 mph67.2 mph−2.8
80 mph76.8 mph−3.2

Gear ratio to match

CurrentEquivalent
3.423.28
3.553.41
3.733.58
4.103.94

245/75R16 is 1.26" shorter than 235/85R16, a −3.97% 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 0.63" (half the diameter change), and the tire needs 0.63" less room above it.

245/75R16 is 0.39" wider. On the same wheel offset about half of that, 0.20", moves toward the suspension and half toward the fender.

Both fit a 16" wheel; the sidewall is 0.63" shorter on 245/75R16.

Details: 235/85R16 in inches · 245/75R16 in inches · change sizes in the calculator

FAQ

What is the difference between 235/85R16 and 245/75R16?

245/75R16 is 1.26" shorter (−3.97%) and 0.39" wider than 235/85R16.

Will 245/75R16 change my speedometer?

Yes, by −3.97%. When the speedometer shows 60 mph you would be going 57.6 mph.

Can I replace 235/85R16 with 245/75R16?

It is a −4.0% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.