Tire Size Box

345/35R22 vs 335/40R22

335/40R22 compared with 345/35R22

+3.3% diameter, −0.4" width

335/40R22 is 32.55" tall vs 31.51". More than the 3% rule of thumb, so check carefully before switching.

31.5"22" rim4.8"13.6" wide
345/35R22 (solid) compared with 335/40R22 (dashed outline), drawn to scale

With 335/40R22 tires, when your speedometer says 60 mph you are really going

62.0 mph

335/40R22 is +1.04 inches (+3.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/35R22335/40R22Difference%
Overall diameter31.51"32.55"+1.04"+3.3%
Section width13.58"13.19"−0.39"−2.9%
Sidewall height4.75"5.28"+0.52"+11.0%
Circumference98.98"102.26"+3.28"+3.3%
Revolutions per mile640.1619.6−20.5−3.2%

Speedometer difference

If your vehicle came with 345/35R22 and you fit 335/40R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.7 mph+1.7 mph
60 mph62.0 mph+2.0 mph
65 mph67.2 mph+2.2 mph
70 mph72.3 mph+2.3 mph
75 mph77.5 mph+2.5 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 345/35R22 or 335/40R22?
335/40R22 is taller by 1.04 inches (32.55" vs 31.51"). 345/35R22 is wider by 0.39 inches.
Can I replace 345/35R22 with 335/40R22?
It is not recommended without checking carefully. The diameter difference is +3.3%, 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 335/40R22 change my speedometer?
When your speedometer reads 60 mph with 335/40R22 fitted (calibrated for 345/35R22), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.3%.
Will 335/40R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.52 inches of ground clearance at the axle.

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