Tire Size Box

265/60R15 vs 285/60R15

285/60R15 compared with 265/60R15

+3.4% diameter, +0.8" width

285/60R15 is 28.46" tall vs 27.52". More than the 3% rule of thumb, so check carefully before switching.

27.5"15" rim6.3"10.4" wide
265/60R15 (solid) compared with 285/60R15 (dashed outline), drawn to scale

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

62.1 mph

285/60R15 is +0.94 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/60R15285/60R15Difference%
Overall diameter27.52"28.46"+0.94"+3.4%
Section width10.43"11.22"+0.79"+7.5%
Sidewall height6.26"6.73"+0.47"+7.5%
Circumference86.46"89.42"+2.97"+3.4%
Revolutions per mile732.9708.5−24.3−3.3%

Speedometer difference

If your vehicle came with 265/60R15 and you fit 285/60R15, 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 mph62.1 mph+2.1 mph
65 mph67.2 mph+2.2 mph
70 mph72.4 mph+2.4 mph
75 mph77.6 mph+2.6 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 265/60R15 or 285/60R15?
285/60R15 is taller by 0.94 inches (28.46" vs 27.52"). 285/60R15 is wider by 0.79 inches.
Can I replace 265/60R15 with 285/60R15?
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 285/60R15 change my speedometer?
When your speedometer reads 60 mph with 285/60R15 fitted (calibrated for 265/60R15), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.4%.
Will 285/60R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.47 inches of ground clearance at the axle.

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