Tire Size Box

345/35R19 vs 335/40R19

335/40R19 compared with 345/35R19

+3.7% diameter, −0.4" width

335/40R19 is 29.55" tall vs 28.51". More than the 3% rule of thumb, so check carefully before switching.

28.5"19" rim4.8"13.6" wide
345/35R19 (solid) compared with 335/40R19 (dashed outline), drawn to scale

With 335/40R19 tires, when your speedometer says 60 mph you are really going

62.2 mph

335/40R19 is +1.04 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/35R19335/40R19Difference%
Overall diameter28.51"29.55"+1.04"+3.7%
Section width13.58"13.19"−0.39"−2.9%
Sidewall height4.75"5.28"+0.52"+11.0%
Circumference89.56"92.84"+3.28"+3.7%
Revolutions per mile707.5682.5−25.0−3.5%

Speedometer difference

If your vehicle came with 345/35R19 and you fit 335/40R19, 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 mph41.5 mph+1.5 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 345/35R19 or 335/40R19?
335/40R19 is taller by 1.04 inches (29.55" vs 28.51"). 345/35R19 is wider by 0.39 inches.
Can I replace 345/35R19 with 335/40R19?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 335/40R19 change my speedometer?
When your speedometer reads 60 mph with 335/40R19 fitted (calibrated for 345/35R19), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 335/40R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.52 inches of ground clearance at the axle.

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