Tire Size Box

225/55R19 vs 245/55R19

245/55R19 compared with 225/55R19

+3.0% diameter, +0.8" width

245/55R19 is 29.61" tall vs 28.74". More than the 3% rule of thumb, so check carefully before switching.

28.7"19" rim4.9"8.9" wide
225/55R19 (solid) compared with 245/55R19 (dashed outline), drawn to scale

With 245/55R19 tires, when your speedometer says 60 mph you are really going

61.8 mph

245/55R19 is +0.87 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/55R19245/55R19Difference%
Overall diameter28.74"29.61"+0.87"+3.0%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height4.87"5.31"+0.43"+8.9%
Circumference90.30"93.02"+2.72"+3.0%
Revolutions per mile701.6681.1−20.5−2.9%

Speedometer difference

If your vehicle came with 225/55R19 and you fit 245/55R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.8 mph+1.8 mph
65 mph67.0 mph+2.0 mph
70 mph72.1 mph+2.1 mph
75 mph77.3 mph+2.3 mph
80 mph82.4 mph+2.4 mph

Each size on its own

Questions

Which is bigger, 225/55R19 or 245/55R19?
245/55R19 is taller by 0.87 inches (29.61" vs 28.74"). 245/55R19 is wider by 0.79 inches.
Can I replace 225/55R19 with 245/55R19?
It is not recommended without checking carefully. The diameter difference is +3.0%, 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 245/55R19 change my speedometer?
When your speedometer reads 60 mph with 245/55R19 fitted (calibrated for 225/55R19), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 245/55R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.43 inches of ground clearance at the axle.

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