Tire Size Box

245/75R14 vs 265/75R14

265/75R14 compared with 245/75R14

+4.1% diameter, +0.8" width

265/75R14 is 29.65" tall vs 28.47". More than the 3% rule of thumb, so check carefully before switching.

28.5"14" rim7.2"9.6" wide
245/75R14 (solid) compared with 265/75R14 (dashed outline), drawn to scale

With 265/75R14 tires, when your speedometer says 60 mph you are really going

62.5 mph

265/75R14 is +1.18 inches (+4.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/75R14265/75R14Difference%
Overall diameter28.47"29.65"+1.18"+4.1%
Section width9.65"10.43"+0.79"+8.2%
Sidewall height7.23"7.82"+0.59"+8.2%
Circumference89.44"93.15"+3.71"+4.1%
Revolutions per mile708.4680.2−28.2−4.0%

Speedometer difference

If your vehicle came with 245/75R14 and you fit 265/75R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.7 mph+1.7 mph
50 mph52.1 mph+2.1 mph
60 mph62.5 mph+2.5 mph
65 mph67.7 mph+2.7 mph
70 mph72.9 mph+2.9 mph
75 mph78.1 mph+3.1 mph
80 mph83.3 mph+3.3 mph

Each size on its own

Questions

Which is bigger, 245/75R14 or 265/75R14?
265/75R14 is taller by 1.18 inches (29.65" vs 28.47"). 265/75R14 is wider by 0.79 inches.
Can I replace 245/75R14 with 265/75R14?
It is not recommended without checking carefully. The diameter difference is +4.1%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 265/75R14 change my speedometer?
When your speedometer reads 60 mph with 265/75R14 fitted (calibrated for 245/75R14), your real speed is 62.5 mph. Your odometer will under-count miles by about 4.1%.
Will 265/75R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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