Tire Size Box

325/30R19 vs 325/35R19

325/35R19 compared with 325/30R19

+4.8% diameter, 0.0" width

325/35R19 is 27.96" tall vs 26.68". More than the 3% rule of thumb, so check carefully before switching.

26.7"19" rim3.8"12.8" wide
325/30R19 (solid) compared with 325/35R19 (dashed outline), drawn to scale

With 325/35R19 tires, when your speedometer says 60 mph you are really going

62.9 mph

325/35R19 is +1.28 inches (+4.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

325/30R19325/35R19Difference%
Overall diameter26.68"27.96"+1.28"+4.8%
Section width12.80"12.80"0.00"0.0%
Sidewall height3.84"4.48"+0.64"+16.7%
Circumference83.81"87.83"+4.02"+4.8%
Revolutions per mile756.0721.4−34.6−4.6%

Speedometer difference

If your vehicle came with 325/30R19 and you fit 325/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.0 mph+1.0 mph
30 mph31.4 mph+1.4 mph
40 mph41.9 mph+1.9 mph
50 mph52.4 mph+2.4 mph
60 mph62.9 mph+2.9 mph
65 mph68.1 mph+3.1 mph
70 mph73.4 mph+3.4 mph
75 mph78.6 mph+3.6 mph
80 mph83.8 mph+3.8 mph

Each size on its own

Questions

Which is bigger, 325/30R19 or 325/35R19?
325/35R19 is taller by 1.28 inches (27.96" vs 26.68"). 325/30R19 is the same width.
Can I replace 325/30R19 with 325/35R19?
It is not recommended without checking carefully. The diameter difference is +4.8%, 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 325/35R19 change my speedometer?
When your speedometer reads 60 mph with 325/35R19 fitted (calibrated for 325/30R19), your real speed is 62.9 mph. Your odometer will under-count miles by about 4.8%.
Will 325/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.64 inches of ground clearance at the axle.

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