Tire Size Box

335/25R19 vs 335/30R19

335/30R19 compared with 335/25R19

+5.2% diameter, 0.0" width

335/30R19 is 26.91" 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 335/30R19 (dashed outline), drawn to scale

With 335/30R19 tires, when your speedometer says 60 mph you are really going

63.1 mph

335/30R19 is +1.32 inches (+5.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/25R19335/30R19Difference%
Overall diameter25.59"26.91"+1.32"+5.2%
Section width13.19"13.19"0.00"0.0%
Sidewall height3.30"3.96"+0.66"+20.0%
Circumference80.41"84.55"+4.14"+5.2%
Revolutions per mile788.0749.4−38.6−4.9%

Speedometer difference

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

Speedometer showsActual speedDifference
20 mph21.0 mph+1.0 mph
30 mph31.5 mph+1.5 mph
40 mph42.1 mph+2.1 mph
50 mph52.6 mph+2.6 mph
60 mph63.1 mph+3.1 mph
65 mph68.3 mph+3.3 mph
70 mph73.6 mph+3.6 mph
75 mph78.9 mph+3.9 mph
80 mph84.1 mph+4.1 mph

Each size on its own

Questions

Which is bigger, 335/25R19 or 335/30R19?
335/30R19 is taller by 1.32 inches (26.91" vs 25.59"). 335/25R19 is the same width.
Can I replace 335/25R19 with 335/30R19?
It is not recommended without checking carefully. The diameter difference is +5.2%, 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 335/30R19 change my speedometer?
When your speedometer reads 60 mph with 335/30R19 fitted (calibrated for 335/25R19), your real speed is 63.1 mph. Your odometer will under-count miles by about 5.2%.
Will 335/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.66 inches of ground clearance at the axle.

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