Tire Size Box

225/50R19 vs 225/55R19

225/55R19 compared with 225/50R19

+3.2% diameter, 0.0" width

225/55R19 is 28.74" tall vs 27.86". More than the 3% rule of thumb, so check carefully before switching.

27.9"19" rim4.4"8.9" wide
225/50R19 (solid) compared with 225/55R19 (dashed outline), drawn to scale

With 225/55R19 tires, when your speedometer says 60 mph you are really going

61.9 mph

225/55R19 is +0.89 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/50R19225/55R19Difference%
Overall diameter27.86"28.74"+0.89"+3.2%
Section width8.86"8.86"0.00"0.0%
Sidewall height4.43"4.87"+0.44"+10.0%
Circumference87.52"90.30"+2.78"+3.2%
Revolutions per mile724.0701.6−22.3−3.1%

Speedometer difference

If your vehicle came with 225/50R19 and you fit 225/55R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.1 mph+2.1 mph
70 mph72.2 mph+2.2 mph
75 mph77.4 mph+2.4 mph
80 mph82.5 mph+2.5 mph

Each size on its own

Questions

Which is bigger, 225/50R19 or 225/55R19?
225/55R19 is taller by 0.89 inches (28.74" vs 27.86"). 225/50R19 is the same width.
Can I replace 225/50R19 with 225/55R19?
It is not recommended without checking carefully. The diameter difference is +3.2%, 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 225/55R19 change my speedometer?
When your speedometer reads 60 mph with 225/55R19 fitted (calibrated for 225/50R19), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 225/55R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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