Tire Size Box

335/40R19 vs 335/50R19

335/50R19 compared with 335/40R19

+8.9% diameter, 0.0" width

335/50R19 is 32.19" tall vs 29.55". More than the 3% rule of thumb, so check carefully before switching.

29.6"19" rim5.3"13.2" wide
335/40R19 (solid) compared with 335/50R19 (dashed outline), drawn to scale

With 335/50R19 tires, when your speedometer says 60 mph you are really going

65.4 mph

335/50R19 is +2.64 inches (+8.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/40R19335/50R19Difference%
Overall diameter29.55"32.19"+2.64"+8.9%
Section width13.19"13.19"0.00"0.0%
Sidewall height5.28"6.59"+1.32"+25.0%
Circumference92.84"101.12"+8.29"+8.9%
Revolutions per mile682.5626.6−55.9−8.2%

Speedometer difference

If your vehicle came with 335/40R19 and you fit 335/50R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.8 mph+1.8 mph
30 mph32.7 mph+2.7 mph
40 mph43.6 mph+3.6 mph
50 mph54.5 mph+4.5 mph
60 mph65.4 mph+5.4 mph
65 mph70.8 mph+5.8 mph
70 mph76.2 mph+6.2 mph
75 mph81.7 mph+6.7 mph
80 mph87.1 mph+7.1 mph

Each size on its own

Questions

Which is bigger, 335/40R19 or 335/50R19?
335/50R19 is taller by 2.64 inches (32.19" vs 29.55"). 335/40R19 is the same width.
Can I replace 335/40R19 with 335/50R19?
It is not recommended without checking carefully. The diameter difference is +8.9%, 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 335/50R19 change my speedometer?
When your speedometer reads 60 mph with 335/50R19 fitted (calibrated for 335/40R19), your real speed is 65.4 mph. Your odometer will under-count miles by about 8.9%.
Will 335/50R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.32 inches of ground clearance at the axle.

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