245/75R17 vs 265/70R17

265/70R17 is 0.1" taller than 245/75R17 (0.4%)

Diameter difference+0.44%diameter 31.47" → 31.61"
245/75R17265/70R17
245/75R17265/70R17Difference
Overall diameter31.47"31.61"+0.14"
Section width9.65"10.43"+0.79"
Sidewall height7.23"7.30"+0.07"
Circumference98.9"99.3"+0.4"
Revolutions per mile641638−3
Wheel diameter17"17"±0"

Speedometer

ShowsActualDiff
30 mph30.1 mph+0.1
45 mph45.2 mph+0.2
60 mph60.3 mph+0.3
70 mph70.3 mph+0.3
80 mph80.4 mph+0.4

Gear ratio to match

CurrentEquivalent
3.423.43
3.553.57
3.733.75
4.104.12

265/70R17 is 0.14" taller than 245/75R17, a +0.44% change in diameter, inside the 3% range most shops treat as a safe swap.

Ground clearance changes by 0.07" (half the diameter change), and the tire needs 0.07" more room above it.

265/70R17 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 0.07" taller on 265/70R17.

Details: 245/75R17 in inches · 265/70R17 in inches · change sizes in the calculator

FAQ

What is the difference between 245/75R17 and 265/70R17?

265/70R17 is 0.14" taller (+0.44%) and 0.79" wider than 245/75R17.

Will 265/70R17 change my speedometer?

Yes, by +0.44%. When the speedometer shows 60 mph you would be going 60.3 mph.

Can I replace 245/75R17 with 265/70R17?

Often yes: the diameter change of +0.4% is within the common 3% guideline. Check the load index, speed rating and clearance.