Tire Size Box

345/25R19 vs 335/30R19

335/30R19 compared with 345/25R19

+4.4% diameter, −0.4" width

335/30R19 is 26.91" tall vs 25.79". More than the 3% rule of thumb, so check carefully before switching.

25.8"19" rim3.4"13.6" wide
345/25R19 (solid) compared with 335/30R19 (dashed outline), drawn to scale

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

62.6 mph

335/30R19 is +1.12 inches (+4.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/25R19335/30R19Difference%
Overall diameter25.79"26.91"+1.12"+4.4%
Section width13.58"13.19"−0.39"−2.9%
Sidewall height3.40"3.96"+0.56"+16.5%
Circumference81.03"84.55"+3.53"+4.4%
Revolutions per mile782.0749.4−32.6−4.2%

Speedometer difference

If your vehicle came with 345/25R19 and you fit 335/30R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.2 mph+2.2 mph
60 mph62.6 mph+2.6 mph
65 mph67.8 mph+2.8 mph
70 mph73.0 mph+3.0 mph
75 mph78.3 mph+3.3 mph
80 mph83.5 mph+3.5 mph

Each size on its own

Questions

Which is bigger, 345/25R19 or 335/30R19?
335/30R19 is taller by 1.12 inches (26.91" vs 25.79"). 345/25R19 is wider by 0.39 inches.
Can I replace 345/25R19 with 335/30R19?
It is not recommended without checking carefully. The diameter difference is +4.4%, 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 345/25R19), your real speed is 62.6 mph. Your odometer will under-count miles by about 4.4%.
Will 335/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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