Tire Size Box

285/60R15 vs 285/65R15

285/65R15 compared with 285/60R15

+3.9% diameter, 0.0" width

285/65R15 is 29.59" tall vs 28.46". More than the 3% rule of thumb, so check carefully before switching.

28.5"15" rim6.7"11.2" wide
285/60R15 (solid) compared with 285/65R15 (dashed outline), drawn to scale

With 285/65R15 tires, when your speedometer says 60 mph you are really going

62.4 mph

285/65R15 is +1.12 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/60R15285/65R15Difference%
Overall diameter28.46"29.59"+1.12"+3.9%
Section width11.22"11.22"0.00"0.0%
Sidewall height6.73"7.29"+0.56"+8.3%
Circumference89.42"92.95"+3.53"+3.9%
Revolutions per mile708.5681.7−26.9−3.8%

Speedometer difference

If your vehicle came with 285/60R15 and you fit 285/65R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.8 mph+2.8 mph
75 mph78.0 mph+3.0 mph
80 mph83.2 mph+3.2 mph

Each size on its own

Questions

Which is bigger, 285/60R15 or 285/65R15?
285/65R15 is taller by 1.12 inches (29.59" vs 28.46"). 285/60R15 is the same width.
Can I replace 285/60R15 with 285/65R15?
It is not recommended without checking carefully. The diameter difference is +3.9%, 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 285/65R15 change my speedometer?
When your speedometer reads 60 mph with 285/65R15 fitted (calibrated for 285/60R15), your real speed is 62.4 mph. Your odometer will under-count miles by about 3.9%.
Will 285/65R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

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