Tire Size Box

275/25R19 vs 265/30R19

265/30R19 compared with 275/25R19

+3.5% diameter, −0.4" width

265/30R19 is 25.26" tall vs 24.41". More than the 3% rule of thumb, so check carefully before switching.

24.4"19" rim2.7"10.8" wide
275/25R19 (solid) compared with 265/30R19 (dashed outline), drawn to scale

With 265/30R19 tires, when your speedometer says 60 mph you are really going

62.1 mph

265/30R19 is +0.85 inches (+3.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/25R19265/30R19Difference%
Overall diameter24.41"25.26"+0.85"+3.5%
Section width10.83"10.43"−0.39"−3.6%
Sidewall height2.71"3.13"+0.42"+15.6%
Circumference76.70"79.36"+2.66"+3.5%
Revolutions per mile826.1798.4−27.7−3.4%

Speedometer difference

If your vehicle came with 275/25R19 and you fit 265/30R19, 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 mph41.4 mph+1.4 mph
50 mph51.7 mph+1.7 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.4 mph+2.4 mph
75 mph77.6 mph+2.6 mph
80 mph82.8 mph+2.8 mph

Each size on its own

Questions

Which is bigger, 275/25R19 or 265/30R19?
265/30R19 is taller by 0.85 inches (25.26" vs 24.41"). 275/25R19 is wider by 0.39 inches.
Can I replace 275/25R19 with 265/30R19?
It is not recommended without checking carefully. The diameter difference is +3.5%, 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 265/30R19 change my speedometer?
When your speedometer reads 60 mph with 265/30R19 fitted (calibrated for 275/25R19), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.5%.
Will 265/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.42 inches of ground clearance at the axle.

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