245/60R20 vs 265/60R20

265/60R20 is 0.9" taller than 245/60R20 (3.0%)

Diameter difference+2.99%diameter 31.57" → 32.52"
245/60R20265/60R20
245/60R20265/60R20Difference
Overall diameter31.57"32.52"+0.94"
Section width9.65"10.43"+0.79"
Sidewall height5.79"6.26"+0.47"
Circumference99.2"102.2"+3.0"
Revolutions per mile639620−19
Wheel diameter20"20"±0"

Speedometer

ShowsActualDiff
30 mph30.9 mph+0.9
45 mph46.3 mph+1.3
60 mph61.8 mph+1.8
70 mph72.1 mph+2.1
80 mph82.4 mph+2.4

Gear ratio to match

CurrentEquivalent
3.423.52
3.553.66
3.733.84
4.104.22

265/60R20 is 0.94" taller than 245/60R20, a +2.99% change in diameter, inside the 3% range most shops treat as a safe swap.

Ground clearance changes by 0.47" (half the diameter change), and the tire needs 0.47" more room above it.

265/60R20 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 20" wheel; the sidewall is 0.47" taller on 265/60R20.

Details: 245/60R20 in inches · 265/60R20 in inches · change sizes in the calculator

FAQ

What is the difference between 245/60R20 and 265/60R20?

265/60R20 is 0.94" taller (+2.99%) and 0.79" wider than 245/60R20.

Will 265/60R20 change my speedometer?

Yes, by +2.99%. When the speedometer shows 60 mph you would be going 61.8 mph.

Can I replace 245/60R20 with 265/60R20?

Often yes: the diameter change of +3.0% is within the common 3% guideline. Check the load index, speed rating and clearance.