Tire Size Box

265/60R17 vs 285/60R17

285/60R17 compared with 265/60R17

+3.2% diameter, +0.8" width

285/60R17 is 30.46" tall vs 29.52". More than the 3% rule of thumb, so check carefully before switching.

29.5"17" rim6.3"10.4" wide
265/60R17 (solid) compared with 285/60R17 (dashed outline), drawn to scale

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

61.9 mph

285/60R17 is +0.94 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/60R17285/60R17Difference%
Overall diameter29.52"30.46"+0.94"+3.2%
Section width10.43"11.22"+0.79"+7.5%
Sidewall height6.26"6.73"+0.47"+7.5%
Circumference92.74"95.71"+2.97"+3.2%
Revolutions per mile683.2662.0−21.2−3.1%

Speedometer difference

If your vehicle came with 265/60R17 and you fit 285/60R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.1 mph+2.1 mph
70 mph72.2 mph+2.2 mph
75 mph77.4 mph+2.4 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 265/60R17 or 285/60R17?
285/60R17 is taller by 0.94 inches (30.46" vs 29.52"). 285/60R17 is wider by 0.79 inches.
Can I replace 265/60R17 with 285/60R17?
It is not recommended without checking carefully. The diameter difference is +3.2%, 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 285/60R17 change my speedometer?
When your speedometer reads 60 mph with 285/60R17 fitted (calibrated for 265/60R17), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 285/60R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.47 inches of ground clearance at the axle.

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