Tire Size Box

225/40R19 vs 225/50R19

225/50R19 compared with 225/40R19

+6.8% diameter, 0.0" width

225/50R19 is 27.86" tall vs 26.09". More than the 3% rule of thumb, so check carefully before switching.

26.1"19" rim3.5"8.9" wide
225/40R19 (solid) compared with 225/50R19 (dashed outline), drawn to scale

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

64.1 mph

225/50R19 is +1.77 inches (+6.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/40R19225/50R19Difference%
Overall diameter26.09"27.86"+1.77"+6.8%
Section width8.86"8.86"0.00"0.0%
Sidewall height3.54"4.43"+0.89"+25.0%
Circumference81.95"87.52"+5.57"+6.8%
Revolutions per mile773.1724.0−49.2−6.4%

Speedometer difference

If your vehicle came with 225/40R19 and you fit 225/50R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.0 mph+2.0 mph
40 mph42.7 mph+2.7 mph
50 mph53.4 mph+3.4 mph
60 mph64.1 mph+4.1 mph
65 mph69.4 mph+4.4 mph
70 mph74.8 mph+4.8 mph
75 mph80.1 mph+5.1 mph
80 mph85.4 mph+5.4 mph

Each size on its own

Questions

Which is bigger, 225/40R19 or 225/50R19?
225/50R19 is taller by 1.77 inches (27.86" vs 26.09"). 225/40R19 is the same width.
Can I replace 225/40R19 with 225/50R19?
It is not recommended without checking carefully. The diameter difference is +6.8%, 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 225/40R19), your real speed is 64.1 mph. Your odometer will under-count miles by about 6.8%.
Will 225/50R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.89 inches of ground clearance at the axle.

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