Tire Size Box

295/25R19 vs 285/30R19

285/30R19 compared with 295/25R19

+3.7% diameter, −0.4" width

285/30R19 is 25.73" tall vs 24.81". More than the 3% rule of thumb, so check carefully before switching.

24.8"19" rim2.9"11.6" wide
295/25R19 (solid) compared with 285/30R19 (dashed outline), drawn to scale

With 285/30R19 tires, when your speedometer says 60 mph you are really going

62.2 mph

285/30R19 is +0.93 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/25R19285/30R19Difference%
Overall diameter24.81"25.73"+0.93"+3.7%
Section width11.61"11.22"−0.39"−3.4%
Sidewall height2.90"3.37"+0.46"+15.9%
Circumference77.93"80.84"+2.91"+3.7%
Revolutions per mile813.0783.8−29.2−3.6%

Speedometer difference

If your vehicle came with 295/25R19 and you fit 285/30R19, 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 mph51.9 mph+1.9 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 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, 295/25R19 or 285/30R19?
285/30R19 is taller by 0.93 inches (25.73" vs 24.81"). 295/25R19 is wider by 0.39 inches.
Can I replace 295/25R19 with 285/30R19?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 285/30R19 change my speedometer?
When your speedometer reads 60 mph with 285/30R19 fitted (calibrated for 295/25R19), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 285/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.46 inches of ground clearance at the axle.

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