245/75R16 vs 225/75R16

245/75R16 is 1.2" taller than 225/75R16 (3.9%)

Diameter difference−3.88%diameter 30.47" → 29.29"
245/75R16225/75R16
245/75R16225/75R16Difference
Overall diameter30.47"29.29"−1.18"
Section width9.65"8.86"−0.79"
Sidewall height7.23"6.64"−0.59"
Circumference95.7"92.0"−3.7"
Revolutions per mile662689+27
Wheel diameter16"16"±0"

Speedometer

ShowsActualDiff
30 mph28.8 mph−1.2
45 mph43.3 mph−1.7
60 mph57.7 mph−2.3
70 mph67.3 mph−2.7
80 mph76.9 mph−3.1

Gear ratio to match

CurrentEquivalent
3.423.29
3.553.41
3.733.59
4.103.94

225/75R16 is 1.18" shorter than 245/75R16, a −3.88% 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 0.59" (half the diameter change), and the tire needs 0.59" less room above it.

245/75R16 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 16" wheel; the sidewall is 0.59" shorter on 225/75R16.

Details: 245/75R16 in inches · 225/75R16 in inches · change sizes in the calculator

FAQ

What is the difference between 245/75R16 and 225/75R16?

225/75R16 is 1.18" shorter (−3.88%) and 0.79" narrower than 245/75R16.

Will 225/75R16 change my speedometer?

Yes, by −3.88%. When the speedometer shows 60 mph you would be going 57.7 mph.

Can I replace 245/75R16 with 225/75R16?

It is a −3.9% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.