Tire Size Box

225/50R18 vs 225/60R18

225/60R18 compared with 225/50R18

+6.6% diameter, 0.0" width

225/60R18 is 28.63" tall vs 26.86". More than the 3% rule of thumb, so check carefully before switching.

26.9"18" rim4.4"8.9" wide
225/50R18 (solid) compared with 225/60R18 (dashed outline), drawn to scale

With 225/60R18 tires, when your speedometer says 60 mph you are really going

64.0 mph

225/60R18 is +1.77 inches (+6.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/50R18225/60R18Difference%
Overall diameter26.86"28.63"+1.77"+6.6%
Section width8.86"8.86"0.00"0.0%
Sidewall height4.43"5.31"+0.89"+20.0%
Circumference84.38"89.94"+5.57"+6.6%
Revolutions per mile750.9704.4−46.5−6.2%

Speedometer difference

If your vehicle came with 225/50R18 and you fit 225/60R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.3 mph+1.3 mph
30 mph32.0 mph+2.0 mph
40 mph42.6 mph+2.6 mph
50 mph53.3 mph+3.3 mph
60 mph64.0 mph+4.0 mph
65 mph69.3 mph+4.3 mph
70 mph74.6 mph+4.6 mph
75 mph79.9 mph+4.9 mph
80 mph85.3 mph+5.3 mph

Each size on its own

Questions

Which is bigger, 225/50R18 or 225/60R18?
225/60R18 is taller by 1.77 inches (28.63" vs 26.86"). 225/50R18 is the same width.
Can I replace 225/50R18 with 225/60R18?
It is not recommended without checking carefully. The diameter difference is +6.6%, 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 225/60R18 change my speedometer?
When your speedometer reads 60 mph with 225/60R18 fitted (calibrated for 225/50R18), your real speed is 64.0 mph. Your odometer will under-count miles by about 6.6%.
Will 225/60R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.89 inches of ground clearance at the axle.

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