Tire Size Box

265/70R17 vs 265/75R17

265/75R17 compared with 265/70R17

+3.3% diameter, 0.0" width

265/75R17 is 32.65" tall vs 31.61". More than the 3% rule of thumb, so check carefully before switching.

31.6"17" rim7.3"10.4" wide
265/70R17 (solid) compared with 265/75R17 (dashed outline), drawn to scale

With 265/75R17 tires, when your speedometer says 60 mph you are really going

62.0 mph

265/75R17 is +1.04 inches (+3.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/70R17265/75R17Difference%
Overall diameter31.61"32.65"+1.04"+3.3%
Section width10.43"10.43"0.00"0.0%
Sidewall height7.30"7.82"+0.52"+7.1%
Circumference99.29"102.57"+3.28"+3.3%
Revolutions per mile638.1617.7−20.4−3.2%

Speedometer difference

If your vehicle came with 265/70R17 and you fit 265/75R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.7 mph+1.7 mph
60 mph62.0 mph+2.0 mph
65 mph67.1 mph+2.1 mph
70 mph72.3 mph+2.3 mph
75 mph77.5 mph+2.5 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 265/70R17 or 265/75R17?
265/75R17 is taller by 1.04 inches (32.65" vs 31.61"). 265/70R17 is the same width.
Can I replace 265/70R17 with 265/75R17?
It is not recommended without checking carefully. The diameter difference is +3.3%, 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 265/75R17 change my speedometer?
When your speedometer reads 60 mph with 265/75R17 fitted (calibrated for 265/70R17), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.3%.
Will 265/75R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.52 inches of ground clearance at the axle.

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