265/70R15 vs 235/75R15

265/70R15 is 0.7" taller than 235/75R15 (2.5%)

Diameter difference−2.46%diameter 29.61" → 28.88"
265/70R15235/75R15
265/70R15235/75R15Difference
Overall diameter29.61"28.88"−0.73"
Section width10.43"9.25"−1.18"
Sidewall height7.30"6.94"−0.36"
Circumference93.0"90.7"−2.3"
Revolutions per mile681698+17
Wheel diameter15"15"±0"

Speedometer

ShowsActualDiff
30 mph29.3 mph−0.7
45 mph43.9 mph−1.1
60 mph58.5 mph−1.5
70 mph68.3 mph−1.7
80 mph78.0 mph−2.0

Gear ratio to match

CurrentEquivalent
3.423.34
3.553.46
3.733.64
4.104.00

235/75R15 is 0.73" shorter than 265/70R15, a −2.46% change in diameter, inside the 3% range most shops treat as a safe swap.

Ground clearance changes by 0.36" (half the diameter change), and the tire needs 0.36" less room above it.

265/70R15 is 1.18" wider. On the same wheel offset about half of that, 0.59", moves toward the suspension and half toward the fender.

Both fit a 15" wheel; the sidewall is 0.36" shorter on 235/75R15.

Details: 265/70R15 in inches · 235/75R15 in inches · change sizes in the calculator

FAQ

What is the difference between 265/70R15 and 235/75R15?

235/75R15 is 0.73" shorter (−2.46%) and 1.18" narrower than 265/70R15.

Will 235/75R15 change my speedometer?

Yes, by −2.46%. When the speedometer shows 60 mph you would be going 58.5 mph.

Can I replace 265/70R15 with 235/75R15?

Often yes: the diameter change of −2.5% is within the common 3% guideline. Check the load index, speed rating and clearance.