Tire Size Box

345/35R24 vs 335/40R24

335/40R24 compared with 345/35R24

+3.1% diameter, −0.4" width

335/40R24 is 34.55" tall vs 33.51". More than the 3% rule of thumb, so check carefully before switching.

33.5"24" rim4.8"13.6" wide
345/35R24 (solid) compared with 335/40R24 (dashed outline), drawn to scale

With 335/40R24 tires, when your speedometer says 60 mph you are really going

61.9 mph

335/40R24 is +1.04 inches (+3.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/35R24335/40R24Difference%
Overall diameter33.51"34.55"+1.04"+3.1%
Section width13.58"13.19"−0.39"−2.9%
Sidewall height4.75"5.28"+0.52"+11.0%
Circumference105.27"108.55"+3.28"+3.1%
Revolutions per mile601.9583.7−18.2−3.0%

Speedometer difference

If your vehicle came with 345/35R24 and you fit 335/40R24, 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 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.0 mph+2.0 mph
70 mph72.2 mph+2.2 mph
75 mph77.3 mph+2.3 mph
80 mph82.5 mph+2.5 mph

Each size on its own

Questions

Which is bigger, 345/35R24 or 335/40R24?
335/40R24 is taller by 1.04 inches (34.55" vs 33.51"). 345/35R24 is wider by 0.39 inches.
Can I replace 345/35R24 with 335/40R24?
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 335/40R24 change my speedometer?
When your speedometer reads 60 mph with 335/40R24 fitted (calibrated for 345/35R24), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.1%.
Will 335/40R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.52 inches of ground clearance at the axle.

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