Tire Size Box

285/45R19 vs 285/50R19

285/50R19 compared with 285/45R19

+3.9% diameter, 0.0" width

285/50R19 is 30.22" tall vs 29.10". More than the 3% rule of thumb, so check carefully before switching.

29.1"19" rim5.0"11.2" wide
285/45R19 (solid) compared with 285/50R19 (dashed outline), drawn to scale

With 285/50R19 tires, when your speedometer says 60 mph you are really going

62.3 mph

285/50R19 is +1.12 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/45R19285/50R19Difference%
Overall diameter29.10"30.22"+1.12"+3.9%
Section width11.22"11.22"0.00"0.0%
Sidewall height5.05"5.61"+0.56"+11.1%
Circumference91.42"94.94"+3.53"+3.9%
Revolutions per mile693.1667.4−25.7−3.7%

Speedometer difference

If your vehicle came with 285/45R19 and you fit 285/50R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 285/45R19 or 285/50R19?
285/50R19 is taller by 1.12 inches (30.22" vs 29.10"). 285/45R19 is the same width.
Can I replace 285/45R19 with 285/50R19?
It is not recommended without checking carefully. The diameter difference is +3.9%, 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 285/50R19 change my speedometer?
When your speedometer reads 60 mph with 285/50R19 fitted (calibrated for 285/45R19), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.9%.
Will 285/50R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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