Tire Size Box

355/40R22 vs 355/50R22

355/50R22 compared with 355/40R22

+8.4% diameter, 0.0" width

355/50R22 is 35.98" tall vs 33.18". More than the 3% rule of thumb, so check carefully before switching.

33.2"22" rim5.6"14.0" wide
355/40R22 (solid) compared with 355/50R22 (dashed outline), drawn to scale

With 355/50R22 tires, when your speedometer says 60 mph you are really going

65.1 mph

355/50R22 is +2.80 inches (+8.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

355/40R22355/50R22Difference%
Overall diameter33.18"35.98"+2.80"+8.4%
Section width13.98"13.98"0.00"0.0%
Sidewall height5.59"6.99"+1.40"+25.0%
Circumference104.24"113.02"+8.78"+8.4%
Revolutions per mile607.8560.6−47.2−7.8%

Speedometer difference

If your vehicle came with 355/40R22 and you fit 355/50R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.7 mph+1.7 mph
30 mph32.5 mph+2.5 mph
40 mph43.4 mph+3.4 mph
50 mph54.2 mph+4.2 mph
60 mph65.1 mph+5.1 mph
65 mph70.5 mph+5.5 mph
70 mph75.9 mph+5.9 mph
75 mph81.3 mph+6.3 mph
80 mph86.7 mph+6.7 mph

Each size on its own

Questions

Which is bigger, 355/40R22 or 355/50R22?
355/50R22 is taller by 2.80 inches (35.98" vs 33.18"). 355/40R22 is the same width.
Can I replace 355/40R22 with 355/50R22?
It is not recommended without checking carefully. The diameter difference is +8.4%, 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 355/50R22 change my speedometer?
When your speedometer reads 60 mph with 355/50R22 fitted (calibrated for 355/40R22), your real speed is 65.1 mph. Your odometer will under-count miles by about 8.4%.
Will 355/50R22 lift my vehicle?
Ride height changes by half the diameter difference: +1.40 inches of ground clearance at the axle.

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