Tire Size Box

265/25R22 vs 265/30R22

265/30R22 compared with 265/25R22

+3.8% diameter, 0.0" width

265/30R22 is 28.26" tall vs 27.22". More than the 3% rule of thumb, so check carefully before switching.

27.2"22" rim2.6"10.4" wide
265/25R22 (solid) compared with 265/30R22 (dashed outline), drawn to scale

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

62.3 mph

265/30R22 is +1.04 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/25R22265/30R22Difference%
Overall diameter27.22"28.26"+1.04"+3.8%
Section width10.43"10.43"0.00"0.0%
Sidewall height2.61"3.13"+0.52"+20.0%
Circumference85.50"88.78"+3.28"+3.8%
Revolutions per mile741.0713.7−27.4−3.7%

Speedometer difference

If your vehicle came with 265/25R22 and you fit 265/30R22, 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 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 265/25R22 or 265/30R22?
265/30R22 is taller by 1.04 inches (28.26" vs 27.22"). 265/25R22 is the same width.
Can I replace 265/25R22 with 265/30R22?
It is not recommended without checking carefully. The diameter difference is +3.8%, 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 265/30R22 change my speedometer?
When your speedometer reads 60 mph with 265/30R22 fitted (calibrated for 265/25R22), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 265/30R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.52 inches of ground clearance at the axle.

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