Tire Size Box

335/35R22 vs 325/40R22

325/40R22 compared with 335/35R22

+3.2% diameter, −0.4" width

325/40R22 is 32.24" tall vs 31.23". More than the 3% rule of thumb, so check carefully before switching.

31.2"22" rim4.6"13.2" wide
335/35R22 (solid) compared with 325/40R22 (dashed outline), drawn to scale

With 325/40R22 tires, when your speedometer says 60 mph you are really going

61.9 mph

325/40R22 is +1.00 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/35R22325/40R22Difference%
Overall diameter31.23"32.24"+1.00"+3.2%
Section width13.19"12.80"−0.39"−3.0%
Sidewall height4.62"5.12"+0.50"+10.9%
Circumference98.12"101.27"+3.15"+3.2%
Revolutions per mile645.7625.6−20.1−3.1%

Speedometer difference

If your vehicle came with 335/35R22 and you fit 325/40R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.1 mph+2.1 mph
70 mph72.3 mph+2.3 mph
75 mph77.4 mph+2.4 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 335/35R22 or 325/40R22?
325/40R22 is taller by 1.00 inches (32.24" vs 31.23"). 335/35R22 is wider by 0.39 inches.
Can I replace 335/35R22 with 325/40R22?
It is not recommended without checking carefully. The diameter difference is +3.2%, 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 325/40R22 change my speedometer?
When your speedometer reads 60 mph with 325/40R22 fitted (calibrated for 335/35R22), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 325/40R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.50 inches of ground clearance at the axle.

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