Tire Size Box

335/35R19 vs 325/40R19

325/40R19 compared with 335/35R19

+3.6% diameter, −0.4" width

325/40R19 is 29.24" tall vs 28.23". More than the 3% rule of thumb, so check carefully before switching.

28.2"19" rim4.6"13.2" wide
335/35R19 (solid) compared with 325/40R19 (dashed outline), drawn to scale

With 325/40R19 tires, when your speedometer says 60 mph you are really going

62.1 mph

325/40R19 is +1.00 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/35R19325/40R19Difference%
Overall diameter28.23"29.24"+1.00"+3.6%
Section width13.19"12.80"−0.39"−3.0%
Sidewall height4.62"5.12"+0.50"+10.9%
Circumference88.69"91.85"+3.15"+3.6%
Revolutions per mile714.4689.8−24.5−3.4%

Speedometer difference

If your vehicle came with 335/35R19 and you fit 325/40R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.8 mph+2.8 mph

Each size on its own

Questions

Which is bigger, 335/35R19 or 325/40R19?
325/40R19 is taller by 1.00 inches (29.24" vs 28.23"). 335/35R19 is wider by 0.39 inches.
Can I replace 335/35R19 with 325/40R19?
It is not recommended without checking carefully. The diameter difference is +3.6%, 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 325/40R19 change my speedometer?
When your speedometer reads 60 mph with 325/40R19 fitted (calibrated for 335/35R19), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.6%.
Will 325/40R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.50 inches of ground clearance at the axle.

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