Tire Size Box

285/55R17 vs 285/60R17

285/60R17 compared with 285/55R17

+3.8% diameter, 0.0" width

285/60R17 is 30.46" tall vs 29.34". More than the 3% rule of thumb, so check carefully before switching.

29.3"17" rim6.2"11.2" wide
285/55R17 (solid) compared with 285/60R17 (dashed outline), drawn to scale

With 285/60R17 tires, when your speedometer says 60 mph you are really going

62.3 mph

285/60R17 is +1.12 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/55R17285/60R17Difference%
Overall diameter29.34"30.46"+1.12"+3.8%
Section width11.22"11.22"0.00"0.0%
Sidewall height6.17"6.73"+0.56"+9.1%
Circumference92.18"95.71"+3.53"+3.8%
Revolutions per mile687.3662.0−25.3−3.7%

Speedometer difference

If your vehicle came with 285/55R17 and you fit 285/60R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 285/55R17 or 285/60R17?
285/60R17 is taller by 1.12 inches (30.46" vs 29.34"). 285/55R17 is the same width.
Can I replace 285/55R17 with 285/60R17?
It is not recommended without checking carefully. The diameter difference is +3.8%, 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 285/60R17 change my speedometer?
When your speedometer reads 60 mph with 285/60R17 fitted (calibrated for 285/55R17), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 285/60R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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