245/70R17 vs 265/70R17

265/70R17 is 1.1" taller than 245/70R17 (3.6%)

Diameter difference+3.61%diameter 30.50" → 31.61"
245/70R17265/70R17
245/70R17265/70R17Difference
Overall diameter30.50"31.61"+1.10"
Section width9.65"10.43"+0.79"
Sidewall height6.75"7.30"+0.55"
Circumference95.8"99.3"+3.5"
Revolutions per mile661638−23
Wheel diameter17"17"±0"

Speedometer

ShowsActualDiff
30 mph31.1 mph+1.1
45 mph46.6 mph+1.6
60 mph62.2 mph+2.2
70 mph72.5 mph+2.5
80 mph82.9 mph+2.9

Gear ratio to match

CurrentEquivalent
3.423.54
3.553.68
3.733.86
4.104.25

265/70R17 is 1.10" taller than 245/70R17, a +3.61% 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.

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 0.55" taller on 265/70R17.

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

FAQ

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

265/70R17 is 1.10" taller (+3.61%) and 0.79" wider than 245/70R17.

Will 265/70R17 change my speedometer?

Yes, by +3.61%. When the speedometer shows 60 mph you would be going 62.2 mph.

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

It is a +3.6% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.