Tire Size Box

355/50R19 vs 355/55R19

355/55R19 compared with 355/50R19

+4.2% diameter, 0.0" width

355/55R19 is 34.37" tall vs 32.98". More than the 3% rule of thumb, so check carefully before switching.

33.0"19" rim7.0"14.0" wide
355/50R19 (solid) compared with 355/55R19 (dashed outline), drawn to scale

With 355/55R19 tires, when your speedometer says 60 mph you are really going

62.5 mph

355/55R19 is +1.40 inches (+4.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

355/50R19355/55R19Difference%
Overall diameter32.98"34.37"+1.40"+4.2%
Section width13.98"13.98"0.00"0.0%
Sidewall height6.99"7.69"+0.70"+10.0%
Circumference103.60"107.99"+4.39"+4.2%
Revolutions per mile611.6586.7−24.9−4.1%

Speedometer difference

If your vehicle came with 355/50R19 and you fit 355/55R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.1 mph+2.1 mph
60 mph62.5 mph+2.5 mph
65 mph67.8 mph+2.8 mph
70 mph73.0 mph+3.0 mph
75 mph78.2 mph+3.2 mph
80 mph83.4 mph+3.4 mph

Each size on its own

Questions

Which is bigger, 355/50R19 or 355/55R19?
355/55R19 is taller by 1.40 inches (34.37" vs 32.98"). 355/50R19 is the same width.
Can I replace 355/50R19 with 355/55R19?
It is not recommended without checking carefully. The diameter difference is +4.2%, 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 355/55R19 change my speedometer?
When your speedometer reads 60 mph with 355/55R19 fitted (calibrated for 355/50R19), your real speed is 62.5 mph. Your odometer will under-count miles by about 4.2%.
Will 355/55R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.70 inches of ground clearance at the axle.

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