Tire Size Box

225/80R13 vs 245/80R13

245/80R13 compared with 225/80R13

+4.6% diameter, +0.8" width

245/80R13 is 28.43" tall vs 27.17". More than the 3% rule of thumb, so check carefully before switching.

27.2"13" rim7.1"8.9" wide
225/80R13 (solid) compared with 245/80R13 (dashed outline), drawn to scale

With 245/80R13 tires, when your speedometer says 60 mph you are really going

62.8 mph

245/80R13 is +1.26 inches (+4.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/80R13245/80R13Difference%
Overall diameter27.17"28.43"+1.26"+4.6%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height7.09"7.72"+0.63"+8.9%
Circumference85.37"89.33"+3.96"+4.6%
Revolutions per mile742.2709.3−32.9−4.4%

Speedometer difference

If your vehicle came with 225/80R13 and you fit 245/80R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.4 mph+1.4 mph
40 mph41.9 mph+1.9 mph
50 mph52.3 mph+2.3 mph
60 mph62.8 mph+2.8 mph
65 mph68.0 mph+3.0 mph
70 mph73.2 mph+3.2 mph
75 mph78.5 mph+3.5 mph
80 mph83.7 mph+3.7 mph

Each size on its own

Questions

Which is bigger, 225/80R13 or 245/80R13?
245/80R13 is taller by 1.26 inches (28.43" vs 27.17"). 245/80R13 is wider by 0.79 inches.
Can I replace 225/80R13 with 245/80R13?
It is not recommended without checking carefully. The diameter difference is +4.6%, 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 245/80R13 change my speedometer?
When your speedometer reads 60 mph with 245/80R13 fitted (calibrated for 225/80R13), your real speed is 62.8 mph. Your odometer will under-count miles by about 4.6%.
Will 245/80R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.63 inches of ground clearance at the axle.

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