Tire Size Box

285/50R22 vs 285/55R22

285/55R22 compared with 285/50R22

+3.4% diameter, 0.0" width

285/55R22 is 34.34" tall vs 33.22". More than the 3% rule of thumb, so check carefully before switching.

33.2"22" rim5.6"11.2" wide
285/50R22 (solid) compared with 285/55R22 (dashed outline), drawn to scale

With 285/55R22 tires, when your speedometer says 60 mph you are really going

62.0 mph

285/55R22 is +1.12 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/50R22285/55R22Difference%
Overall diameter33.22"34.34"+1.12"+3.4%
Section width11.22"11.22"0.00"0.0%
Sidewall height5.61"6.17"+0.56"+10.0%
Circumference104.37"107.89"+3.53"+3.4%
Revolutions per mile607.1587.3−19.8−3.3%

Speedometer difference

If your vehicle came with 285/50R22 and you fit 285/55R22, 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, 285/50R22 or 285/55R22?
285/55R22 is taller by 1.12 inches (34.34" vs 33.22"). 285/50R22 is the same width.
Can I replace 285/50R22 with 285/55R22?
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 285/55R22 change my speedometer?
When your speedometer reads 60 mph with 285/55R22 fitted (calibrated for 285/50R22), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.4%.
Will 285/55R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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