Tire Size Box

235/45R19 vs 235/50R19

235/50R19 compared with 235/45R19

+3.4% diameter, 0.0" width

235/50R19 is 28.25" tall vs 27.33". More than the 3% rule of thumb, so check carefully before switching.

27.3"19" rim4.2"9.3" wide
235/45R19 (solid) compared with 235/50R19 (dashed outline), drawn to scale

With 235/50R19 tires, when your speedometer says 60 mph you are really going

62.0 mph

235/50R19 is +0.93 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

235/45R19235/50R19Difference%
Overall diameter27.33"28.25"+0.93"+3.4%
Section width9.25"9.25"0.00"0.0%
Sidewall height4.16"4.63"+0.46"+11.1%
Circumference85.85"88.76"+2.91"+3.4%
Revolutions per mile738.0713.9−24.2−3.3%

Speedometer difference

If your vehicle came with 235/45R19 and you fit 235/50R19, 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 mph41.4 mph+1.4 mph
50 mph51.7 mph+1.7 mph
60 mph62.0 mph+2.0 mph
65 mph67.2 mph+2.2 mph
70 mph72.4 mph+2.4 mph
75 mph77.5 mph+2.5 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 235/45R19 or 235/50R19?
235/50R19 is taller by 0.93 inches (28.25" vs 27.33"). 235/45R19 is the same width.
Can I replace 235/45R19 with 235/50R19?
It is not recommended without checking carefully. The diameter difference is +3.4%, 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 235/50R19 change my speedometer?
When your speedometer reads 60 mph with 235/50R19 fitted (calibrated for 235/45R19), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.4%.
Will 235/50R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.46 inches of ground clearance at the axle.

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