Tire Size Box

275/50R19 vs 275/55R19

275/55R19 compared with 275/50R19

+3.6% diameter, 0.0" width

275/55R19 is 30.91" tall vs 29.83". More than the 3% rule of thumb, so check carefully before switching.

29.8"19" rim5.4"10.8" wide
275/50R19 (solid) compared with 275/55R19 (dashed outline), drawn to scale

With 275/55R19 tires, when your speedometer says 60 mph you are really going

62.2 mph

275/55R19 is +1.08 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/50R19275/55R19Difference%
Overall diameter29.83"30.91"+1.08"+3.6%
Section width10.83"10.83"0.00"0.0%
Sidewall height5.41"5.95"+0.54"+10.0%
Circumference93.70"97.10"+3.40"+3.6%
Revolutions per mile676.2652.5−23.7−3.5%

Speedometer difference

If your vehicle came with 275/50R19 and you fit 275/55R19, 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 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 275/50R19 or 275/55R19?
275/55R19 is taller by 1.08 inches (30.91" vs 29.83"). 275/50R19 is the same width.
Can I replace 275/50R19 with 275/55R19?
It is not recommended without checking carefully. The diameter difference is +3.6%, 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 275/55R19 change my speedometer?
When your speedometer reads 60 mph with 275/55R19 fitted (calibrated for 275/50R19), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.6%.
Will 275/55R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

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