Tire Size Box

335/25R19 vs 325/30R19

325/30R19 compared with 335/25R19

+4.2% diameter, −0.4" width

325/30R19 is 26.68" tall vs 25.59". More than the 3% rule of thumb, so check carefully before switching.

25.6"19" rim3.3"13.2" wide
335/25R19 (solid) compared with 325/30R19 (dashed outline), drawn to scale

With 325/30R19 tires, when your speedometer says 60 mph you are really going

62.5 mph

325/30R19 is +1.08 inches (+4.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/25R19325/30R19Difference%
Overall diameter25.59"26.68"+1.08"+4.2%
Section width13.19"12.80"−0.39"−3.0%
Sidewall height3.30"3.84"+0.54"+16.4%
Circumference80.41"83.81"+3.40"+4.2%
Revolutions per mile788.0756.0−32.0−4.1%

Speedometer difference

If your vehicle came with 335/25R19 and you fit 325/30R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.1 mph+2.1 mph
60 mph62.5 mph+2.5 mph
65 mph67.7 mph+2.7 mph
70 mph73.0 mph+3.0 mph
75 mph78.2 mph+3.2 mph
80 mph83.4 mph+3.4 mph

Each size on its own

Questions

Which is bigger, 335/25R19 or 325/30R19?
325/30R19 is taller by 1.08 inches (26.68" vs 25.59"). 335/25R19 is wider by 0.39 inches.
Can I replace 335/25R19 with 325/30R19?
It is not recommended without checking carefully. The diameter difference is +4.2%, 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 325/30R19 change my speedometer?
When your speedometer reads 60 mph with 325/30R19 fitted (calibrated for 335/25R19), your real speed is 62.5 mph. Your odometer will under-count miles by about 4.2%.
Will 325/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

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