Tire Size Box

335/25R24 vs 335/30R24

335/30R24 compared with 335/25R24

+4.3% diameter, 0.0" width

335/30R24 is 31.91" tall vs 30.59". More than the 3% rule of thumb, so check carefully before switching.

30.6"24" rim3.3"13.2" wide
335/25R24 (solid) compared with 335/30R24 (dashed outline), drawn to scale

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

62.6 mph

335/30R24 is +1.32 inches (+4.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/25R24335/30R24Difference%
Overall diameter30.59"31.91"+1.32"+4.3%
Section width13.19"13.19"0.00"0.0%
Sidewall height3.30"3.96"+0.66"+20.0%
Circumference96.12"100.26"+4.14"+4.3%
Revolutions per mile659.2632.0−27.2−4.1%

Speedometer difference

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

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.2 mph+2.2 mph
60 mph62.6 mph+2.6 mph
65 mph67.8 mph+2.8 mph
70 mph73.0 mph+3.0 mph
75 mph78.2 mph+3.2 mph
80 mph83.4 mph+3.4 mph

Each size on its own

Questions

Which is bigger, 335/25R24 or 335/30R24?
335/30R24 is taller by 1.32 inches (31.91" vs 30.59"). 335/25R24 is the same width.
Can I replace 335/25R24 with 335/30R24?
It is not recommended without checking carefully. The diameter difference is +4.3%, 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 335/25R24), your real speed is 62.6 mph. Your odometer will under-count miles by about 4.3%.
Will 335/30R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.66 inches of ground clearance at the axle.

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