Tire Size Box

225/45R19 vs 225/50R19

225/50R19 compared with 225/45R19

+3.3% diameter, 0.0" width

225/50R19 is 27.86" tall vs 26.97". More than the 3% rule of thumb, so check carefully before switching.

27.0"19" rim4.0"8.9" wide
225/45R19 (solid) compared with 225/50R19 (dashed outline), drawn to scale

With 225/50R19 tires, when your speedometer says 60 mph you are really going

62.0 mph

225/50R19 is +0.89 inches (+3.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/45R19225/50R19Difference%
Overall diameter26.97"27.86"+0.89"+3.3%
Section width8.86"8.86"0.00"0.0%
Sidewall height3.99"4.43"+0.44"+11.1%
Circumference84.74"87.52"+2.78"+3.3%
Revolutions per mile747.7724.0−23.8−3.2%

Speedometer difference

If your vehicle came with 225/45R19 and you fit 225/50R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph62.0 mph+2.0 mph
65 mph67.1 mph+2.1 mph
70 mph72.3 mph+2.3 mph
75 mph77.5 mph+2.5 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 225/45R19 or 225/50R19?
225/50R19 is taller by 0.89 inches (27.86" vs 26.97"). 225/45R19 is the same width.
Can I replace 225/45R19 with 225/50R19?
It is not recommended without checking carefully. The diameter difference is +3.3%, 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 225/50R19 change my speedometer?
When your speedometer reads 60 mph with 225/50R19 fitted (calibrated for 225/45R19), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.3%.
Will 225/50R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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