Tire Size Box

355/45R19 vs 355/50R19

355/50R19 compared with 355/45R19

+4.4% diameter, 0.0" width

355/50R19 is 32.98" tall vs 31.58". More than the 3% rule of thumb, so check carefully before switching.

31.6"19" rim6.3"14.0" wide
355/45R19 (solid) compared with 355/50R19 (dashed outline), drawn to scale

With 355/50R19 tires, when your speedometer says 60 mph you are really going

62.7 mph

355/50R19 is +1.40 inches (+4.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

355/45R19355/50R19Difference%
Overall diameter31.58"32.98"+1.40"+4.4%
Section width13.98"13.98"0.00"0.0%
Sidewall height6.29"6.99"+0.70"+11.1%
Circumference99.21"103.60"+4.39"+4.4%
Revolutions per mile638.7611.6−27.1−4.2%

Speedometer difference

If your vehicle came with 355/45R19 and you fit 355/50R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.3 mph+1.3 mph
40 mph41.8 mph+1.8 mph
50 mph52.2 mph+2.2 mph
60 mph62.7 mph+2.7 mph
65 mph67.9 mph+2.9 mph
70 mph73.1 mph+3.1 mph
75 mph78.3 mph+3.3 mph
80 mph83.5 mph+3.5 mph

Each size on its own

Questions

Which is bigger, 355/45R19 or 355/50R19?
355/50R19 is taller by 1.40 inches (32.98" vs 31.58"). 355/45R19 is the same width.
Can I replace 355/45R19 with 355/50R19?
It is not recommended without checking carefully. The diameter difference is +4.4%, 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 355/50R19 change my speedometer?
When your speedometer reads 60 mph with 355/50R19 fitted (calibrated for 355/45R19), your real speed is 62.7 mph. Your odometer will under-count miles by about 4.4%.
Will 355/50R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.70 inches of ground clearance at the axle.

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