Tire Size Box

355/35R24 vs 335/40R24

335/40R24 compared with 355/35R24

+2.3% diameter, −0.8" width

335/40R24 is 34.55" tall vs 33.78". Within the 3% rule, so usually interchangeable.

33.8"24" rim4.9"14.0" wide
355/35R24 (solid) compared with 335/40R24 (dashed outline), drawn to scale

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

61.4 mph

335/40R24 is +0.77 inches (+2.3%) in overall diameter. That is within the 3% most shops and makers allow.

355/35R24335/40R24Difference%
Overall diameter33.78"34.55"+0.77"+2.3%
Section width13.98"13.19"−0.79"−5.6%
Sidewall height4.89"5.28"+0.38"+7.8%
Circumference106.13"108.55"+2.41"+2.3%
Revolutions per mile597.0583.7−13.3−2.2%

Speedometer difference

If your vehicle came with 355/35R24 and you fit 335/40R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.5 mph+0.5 mph
30 mph30.7 mph+0.7 mph
40 mph40.9 mph+0.9 mph
50 mph51.1 mph+1.1 mph
60 mph61.4 mph+1.4 mph
65 mph66.5 mph+1.5 mph
70 mph71.6 mph+1.6 mph
75 mph76.7 mph+1.7 mph
80 mph81.8 mph+1.8 mph

Each size on its own

Questions

Which is bigger, 355/35R24 or 335/40R24?
335/40R24 is taller by 0.77 inches (34.55" vs 33.78"). 355/35R24 is wider by 0.79 inches.
Can I replace 355/35R24 with 335/40R24?
Usually, yes. The diameter difference is +2.3%, inside the 3% rule of thumb most tire shops use. Check that the wider or taller tire clears your suspension and fenders, and that its load index meets your placard.
How much will 335/40R24 change my speedometer?
When your speedometer reads 60 mph with 335/40R24 fitted (calibrated for 355/35R24), your real speed is 61.4 mph. Your odometer will under-count miles by about 2.3%.
Will 335/40R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.38 inches of ground clearance at the axle.

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