Tire Size Box

265/65R17 vs 265/75R17

265/75R17 compared with 265/65R17

+6.8% diameter, 0.0" width

265/75R17 is 32.65" tall vs 30.56". More than the 3% rule of thumb, so check carefully before switching.

30.6"17" rim6.8"10.4" wide
265/65R17 (solid) compared with 265/75R17 (dashed outline), drawn to scale

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

64.1 mph

265/75R17 is +2.09 inches (+6.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/65R17265/75R17Difference%
Overall diameter30.56"32.65"+2.09"+6.8%
Section width10.43"10.43"0.00"0.0%
Sidewall height6.78"7.82"+1.04"+15.4%
Circumference96.02"102.57"+6.56"+6.8%
Revolutions per mile659.9617.7−42.2−6.4%

Speedometer difference

If your vehicle came with 265/65R17 and you fit 265/75R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.0 mph+2.0 mph
40 mph42.7 mph+2.7 mph
50 mph53.4 mph+3.4 mph
60 mph64.1 mph+4.1 mph
65 mph69.4 mph+4.4 mph
70 mph74.8 mph+4.8 mph
75 mph80.1 mph+5.1 mph
80 mph85.5 mph+5.5 mph

Each size on its own

Questions

Which is bigger, 265/65R17 or 265/75R17?
265/75R17 is taller by 2.09 inches (32.65" vs 30.56"). 265/65R17 is the same width.
Can I replace 265/65R17 with 265/75R17?
It is not recommended without checking carefully. The diameter difference is +6.8%, 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 265/65R17), your real speed is 64.1 mph. Your odometer will under-count miles by about 6.8%.
Will 265/75R17 lift my vehicle?
Ride height changes by half the diameter difference: +1.04 inches of ground clearance at the axle.

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