Tire Size Box

275/25R22 vs 265/30R22

265/30R22 compared with 275/25R22

+3.1% diameter, −0.4" width

265/30R22 is 28.26" tall vs 27.41". More than the 3% rule of thumb, so check carefully before switching.

27.4"22" rim2.7"10.8" wide
275/25R22 (solid) compared with 265/30R22 (dashed outline), drawn to scale

With 265/30R22 tires, when your speedometer says 60 mph you are really going

61.9 mph

265/30R22 is +0.85 inches (+3.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/25R22265/30R22Difference%
Overall diameter27.41"28.26"+0.85"+3.1%
Section width10.83"10.43"−0.39"−3.6%
Sidewall height2.71"3.13"+0.42"+15.6%
Circumference86.12"88.78"+2.66"+3.1%
Revolutions per mile735.7713.7−22.0−3.0%

Speedometer difference

If your vehicle came with 275/25R22 and you fit 265/30R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.9 mph+1.9 mph
65 mph67.0 mph+2.0 mph
70 mph72.2 mph+2.2 mph
75 mph77.3 mph+2.3 mph
80 mph82.5 mph+2.5 mph

Each size on its own

Questions

Which is bigger, 275/25R22 or 265/30R22?
265/30R22 is taller by 0.85 inches (28.26" vs 27.41"). 275/25R22 is wider by 0.39 inches.
Can I replace 275/25R22 with 265/30R22?
It is not recommended without checking carefully. The diameter difference is +3.1%, 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 265/30R22 change my speedometer?
When your speedometer reads 60 mph with 265/30R22 fitted (calibrated for 275/25R22), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.1%.
Will 265/30R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.42 inches of ground clearance at the axle.

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