Tire Size Box

345/25R24 vs 335/30R24

335/30R24 compared with 345/25R24

+3.6% diameter, −0.4" width

335/30R24 is 31.91" tall vs 30.79". More than the 3% rule of thumb, so check carefully before switching.

30.8"24" rim3.4"13.6" wide
345/25R24 (solid) compared with 335/30R24 (dashed outline), drawn to scale

With 335/30R24 tires, when your speedometer says 60 mph you are really going

62.2 mph

335/30R24 is +1.12 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/25R24335/30R24Difference%
Overall diameter30.79"31.91"+1.12"+3.6%
Section width13.58"13.19"−0.39"−2.9%
Sidewall height3.40"3.96"+0.56"+16.5%
Circumference96.73"100.26"+3.53"+3.6%
Revolutions per mile655.0632.0−23.0−3.5%

Speedometer difference

If your vehicle came with 345/25R24 and you fit 335/30R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 345/25R24 or 335/30R24?
335/30R24 is taller by 1.12 inches (31.91" vs 30.79"). 345/25R24 is wider by 0.39 inches.
Can I replace 345/25R24 with 335/30R24?
It is not recommended without checking carefully. The diameter difference is +3.6%, 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 335/30R24 change my speedometer?
When your speedometer reads 60 mph with 335/30R24 fitted (calibrated for 345/25R24), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.6%.
Will 335/30R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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