Tire Size Box

335/25R24 vs 325/30R24

325/30R24 compared with 335/25R24

+3.5% diameter, −0.4" width

325/30R24 is 31.68" 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 325/30R24 (dashed outline), drawn to scale

With 325/30R24 tires, when your speedometer says 60 mph you are really going

62.1 mph

325/30R24 is +1.08 inches (+3.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/25R24325/30R24Difference%
Overall diameter30.59"31.68"+1.08"+3.5%
Section width13.19"12.80"−0.39"−3.0%
Sidewall height3.30"3.84"+0.54"+16.4%
Circumference96.12"99.52"+3.40"+3.5%
Revolutions per mile659.2636.7−22.5−3.4%

Speedometer difference

If your vehicle came with 335/25R24 and you fit 325/30R24, 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 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.8 mph+2.8 mph

Each size on its own

Questions

Which is bigger, 335/25R24 or 325/30R24?
325/30R24 is taller by 1.08 inches (31.68" vs 30.59"). 335/25R24 is wider by 0.39 inches.
Can I replace 335/25R24 with 325/30R24?
It is not recommended without checking carefully. The diameter difference is +3.5%, 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 325/30R24 change my speedometer?
When your speedometer reads 60 mph with 325/30R24 fitted (calibrated for 335/25R24), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.5%.
Will 325/30R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

Other comparisons