Tire Size Box

345/40R22 vs 335/45R22

335/45R22 compared with 345/40R22

+3.1% diameter, −0.4" width

335/45R22 is 33.87" tall vs 32.87". More than the 3% rule of thumb, so check carefully before switching.

32.9"22" rim5.4"13.6" wide
345/40R22 (solid) compared with 335/45R22 (dashed outline), drawn to scale

With 335/45R22 tires, when your speedometer says 60 mph you are really going

61.8 mph

335/45R22 is +1.00 inches (+3.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/40R22335/45R22Difference%
Overall diameter32.87"33.87"+1.00"+3.1%
Section width13.58"13.19"−0.39"−2.9%
Sidewall height5.43"5.94"+0.50"+9.2%
Circumference103.25"106.41"+3.15"+3.1%
Revolutions per mile613.6595.5−18.2−3.0%

Speedometer difference

If your vehicle came with 345/40R22 and you fit 335/45R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.8 mph+1.8 mph
65 mph67.0 mph+2.0 mph
70 mph72.1 mph+2.1 mph
75 mph77.3 mph+2.3 mph
80 mph82.4 mph+2.4 mph

Each size on its own

Questions

Which is bigger, 345/40R22 or 335/45R22?
335/45R22 is taller by 1.00 inches (33.87" vs 32.87"). 345/40R22 is wider by 0.39 inches.
Can I replace 345/40R22 with 335/45R22?
It is not recommended without checking carefully. The diameter difference is +3.1%, 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 335/45R22 change my speedometer?
When your speedometer reads 60 mph with 335/45R22 fitted (calibrated for 345/40R22), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.1%.
Will 335/45R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.50 inches of ground clearance at the axle.

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