Tire Size Box

225/65R13 vs 245/65R13

245/65R13 compared with 225/65R13

+4.2% diameter, +0.8" width

245/65R13 is 25.54" tall vs 24.52". More than the 3% rule of thumb, so check carefully before switching.

24.5"13" rim5.8"8.9" wide
225/65R13 (solid) compared with 245/65R13 (dashed outline), drawn to scale

With 245/65R13 tires, when your speedometer says 60 mph you are really going

62.5 mph

245/65R13 is +1.02 inches (+4.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/65R13245/65R13Difference%
Overall diameter24.52"25.54"+1.02"+4.2%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height5.76"6.27"+0.51"+8.9%
Circumference77.02"80.23"+3.22"+4.2%
Revolutions per mile822.7789.7−33.0−4.0%

Speedometer difference

If your vehicle came with 225/65R13 and you fit 245/65R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.1 mph+2.1 mph
60 mph62.5 mph+2.5 mph
65 mph67.7 mph+2.7 mph
70 mph72.9 mph+2.9 mph
75 mph78.1 mph+3.1 mph
80 mph83.3 mph+3.3 mph

Each size on its own

Questions

Which is bigger, 225/65R13 or 245/65R13?
245/65R13 is taller by 1.02 inches (25.54" vs 24.52"). 245/65R13 is wider by 0.79 inches.
Can I replace 225/65R13 with 245/65R13?
It is not recommended without checking carefully. The diameter difference is +4.2%, 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 245/65R13 change my speedometer?
When your speedometer reads 60 mph with 245/65R13 fitted (calibrated for 225/65R13), your real speed is 62.5 mph. Your odometer will under-count miles by about 4.2%.
Will 245/65R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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