Tire Size Box

225/55R15 vs 225/60R15

225/60R15 compared with 225/55R15

+3.6% diameter, 0.0" width

225/60R15 is 25.63" tall vs 24.74". More than the 3% rule of thumb, so check carefully before switching.

24.7"15" rim4.9"8.9" wide
225/55R15 (solid) compared with 225/60R15 (dashed outline), drawn to scale

With 225/60R15 tires, when your speedometer says 60 mph you are really going

62.1 mph

225/60R15 is +0.89 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/55R15225/60R15Difference%
Overall diameter24.74"25.63"+0.89"+3.6%
Section width8.86"8.86"0.00"0.0%
Sidewall height4.87"5.31"+0.44"+9.1%
Circumference77.74"80.52"+2.78"+3.6%
Revolutions per mile815.1786.9−28.2−3.5%

Speedometer difference

If your vehicle came with 225/55R15 and you fit 225/60R15, 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 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 225/55R15 or 225/60R15?
225/60R15 is taller by 0.89 inches (25.63" vs 24.74"). 225/55R15 is the same width.
Can I replace 225/55R15 with 225/60R15?
It is not recommended without checking carefully. The diameter difference is +3.6%, 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 225/60R15 change my speedometer?
When your speedometer reads 60 mph with 225/60R15 fitted (calibrated for 225/55R15), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.6%.
Will 225/60R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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