Tire Size Box

335/25R22 vs 325/30R22

325/30R22 compared with 335/25R22

+3.8% diameter, −0.4" width

325/30R22 is 29.68" tall vs 28.59". More than the 3% rule of thumb, so check carefully before switching.

28.6"22" rim3.3"13.2" wide
335/25R22 (solid) compared with 325/30R22 (dashed outline), drawn to scale

With 325/30R22 tires, when your speedometer says 60 mph you are really going

62.3 mph

325/30R22 is +1.08 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/25R22325/30R22Difference%
Overall diameter28.59"29.68"+1.08"+3.8%
Section width13.19"12.80"−0.39"−3.0%
Sidewall height3.30"3.84"+0.54"+16.4%
Circumference89.83"93.23"+3.40"+3.8%
Revolutions per mile705.3679.6−25.7−3.6%

Speedometer difference

If your vehicle came with 335/25R22 and you fit 325/30R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 335/25R22 or 325/30R22?
325/30R22 is taller by 1.08 inches (29.68" vs 28.59"). 335/25R22 is wider by 0.39 inches.
Can I replace 335/25R22 with 325/30R22?
It is not recommended without checking carefully. The diameter difference is +3.8%, 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 325/30R22 change my speedometer?
When your speedometer reads 60 mph with 325/30R22 fitted (calibrated for 335/25R22), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 325/30R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

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