Tire Size Box

205/85R13 vs 225/85R13

225/85R13 compared with 205/85R13

+5.0% diameter, +0.8" width

225/85R13 is 28.06" tall vs 26.72". More than the 3% rule of thumb, so check carefully before switching.

26.7"13" rim6.9"8.1" wide
205/85R13 (solid) compared with 225/85R13 (dashed outline), drawn to scale

With 225/85R13 tires, when your speedometer says 60 mph you are really going

63.0 mph

225/85R13 is +1.34 inches (+5.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

205/85R13225/85R13Difference%
Overall diameter26.72"28.06"+1.34"+5.0%
Section width8.07"8.86"+0.79"+9.8%
Sidewall height6.86"7.53"+0.67"+9.8%
Circumference83.94"88.15"+4.21"+5.0%
Revolutions per mile754.8718.8−36.0−4.8%

Speedometer difference

If your vehicle came with 205/85R13 and you fit 225/85R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.0 mph+1.0 mph
30 mph31.5 mph+1.5 mph
40 mph42.0 mph+2.0 mph
50 mph52.5 mph+2.5 mph
60 mph63.0 mph+3.0 mph
65 mph68.3 mph+3.3 mph
70 mph73.5 mph+3.5 mph
75 mph78.8 mph+3.8 mph
80 mph84.0 mph+4.0 mph

Each size on its own

Questions

Which is bigger, 205/85R13 or 225/85R13?
225/85R13 is taller by 1.34 inches (28.06" vs 26.72"). 225/85R13 is wider by 0.79 inches.
Can I replace 205/85R13 with 225/85R13?
It is not recommended without checking carefully. The diameter difference is +5.0%, 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 225/85R13 change my speedometer?
When your speedometer reads 60 mph with 225/85R13 fitted (calibrated for 205/85R13), your real speed is 63.0 mph. Your odometer will under-count miles by about 5.0%.
Will 225/85R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.67 inches of ground clearance at the axle.

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