Tire Size Box

225/25R19 vs 225/30R19

225/30R19 compared with 225/25R19

+3.8% diameter, 0.0" width

225/30R19 is 24.31" tall vs 23.43". More than the 3% rule of thumb, so check carefully before switching.

23.4"19" rim2.2"8.9" wide
225/25R19 (solid) compared with 225/30R19 (dashed outline), drawn to scale

With 225/30R19 tires, when your speedometer says 60 mph you are really going

62.3 mph

225/30R19 is +0.89 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/25R19225/30R19Difference%
Overall diameter23.43"24.31"+0.89"+3.8%
Section width8.86"8.86"0.00"0.0%
Sidewall height2.21"2.66"+0.44"+20.0%
Circumference73.60"76.39"+2.78"+3.8%
Revolutions per mile860.8829.5−31.4−3.6%

Speedometer difference

If your vehicle came with 225/25R19 and you fit 225/30R19, 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 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 225/25R19 or 225/30R19?
225/30R19 is taller by 0.89 inches (24.31" vs 23.43"). 225/25R19 is the same width.
Can I replace 225/25R19 with 225/30R19?
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 225/30R19 change my speedometer?
When your speedometer reads 60 mph with 225/30R19 fitted (calibrated for 225/25R19), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 225/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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