Tire Size Box

285/60R17 vs 285/65R17

285/65R17 compared with 285/60R17

+3.7% diameter, 0.0" width

285/65R17 is 31.59" tall vs 30.46". More than the 3% rule of thumb, so check carefully before switching.

30.5"17" rim6.7"11.2" wide
285/60R17 (solid) compared with 285/65R17 (dashed outline), drawn to scale

With 285/65R17 tires, when your speedometer says 60 mph you are really going

62.2 mph

285/65R17 is +1.12 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/60R17285/65R17Difference%
Overall diameter30.46"31.59"+1.12"+3.7%
Section width11.22"11.22"0.00"0.0%
Sidewall height6.73"7.29"+0.56"+8.3%
Circumference95.71"99.23"+3.53"+3.7%
Revolutions per mile662.0638.5−23.5−3.6%

Speedometer difference

If your vehicle came with 285/60R17 and you fit 285/65R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 285/60R17 or 285/65R17?
285/65R17 is taller by 1.12 inches (31.59" vs 30.46"). 285/60R17 is the same width.
Can I replace 285/60R17 with 285/65R17?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 285/65R17 change my speedometer?
When your speedometer reads 60 mph with 285/65R17 fitted (calibrated for 285/60R17), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 285/65R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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