Tire Size Box

285/55R19 vs 285/65R19

285/65R19 compared with 285/55R19

+7.2% diameter, 0.0" width

285/65R19 is 33.59" tall vs 31.34". More than the 3% rule of thumb, so check carefully before switching.

31.3"19" rim6.2"11.2" wide
285/55R19 (solid) compared with 285/65R19 (dashed outline), drawn to scale

With 285/65R19 tires, when your speedometer says 60 mph you are really going

64.3 mph

285/65R19 is +2.24 inches (+7.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/55R19285/65R19Difference%
Overall diameter31.34"33.59"+2.24"+7.2%
Section width11.22"11.22"0.00"0.0%
Sidewall height6.17"7.29"+1.12"+18.2%
Circumference98.47"105.52"+7.05"+7.2%
Revolutions per mile643.5600.5−43.0−6.7%

Speedometer difference

If your vehicle came with 285/55R19 and you fit 285/65R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.1 mph+2.1 mph
40 mph42.9 mph+2.9 mph
50 mph53.6 mph+3.6 mph
60 mph64.3 mph+4.3 mph
65 mph69.7 mph+4.7 mph
70 mph75.0 mph+5.0 mph
75 mph80.4 mph+5.4 mph
80 mph85.7 mph+5.7 mph

Each size on its own

Questions

Which is bigger, 285/55R19 or 285/65R19?
285/65R19 is taller by 2.24 inches (33.59" vs 31.34"). 285/55R19 is the same width.
Can I replace 285/55R19 with 285/65R19?
It is not recommended without checking carefully. The diameter difference is +7.2%, 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 285/65R19 change my speedometer?
When your speedometer reads 60 mph with 285/65R19 fitted (calibrated for 285/55R19), your real speed is 64.3 mph. Your odometer will under-count miles by about 7.2%.
Will 285/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.12 inches of ground clearance at the axle.

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