Tire Size Box

225/60R14 vs 245/60R14

245/60R14 compared with 225/60R14

+3.8% diameter, +0.8" width

245/60R14 is 25.57" tall vs 24.63". More than the 3% rule of thumb, so check carefully before switching.

24.6"14" rim5.3"8.9" wide
225/60R14 (solid) compared with 245/60R14 (dashed outline), drawn to scale

With 245/60R14 tires, when your speedometer says 60 mph you are really going

62.3 mph

245/60R14 is +0.94 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/60R14245/60R14Difference%
Overall diameter24.63"25.57"+0.94"+3.8%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height5.31"5.79"+0.47"+8.9%
Circumference77.38"80.35"+2.97"+3.8%
Revolutions per mile818.8788.6−30.3−3.7%

Speedometer difference

If your vehicle came with 225/60R14 and you fit 245/60R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 225/60R14 or 245/60R14?
245/60R14 is taller by 0.94 inches (25.57" vs 24.63"). 245/60R14 is wider by 0.79 inches.
Can I replace 225/60R14 with 245/60R14?
It is not recommended without checking carefully. The diameter difference is +3.8%, 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 245/60R14 change my speedometer?
When your speedometer reads 60 mph with 245/60R14 fitted (calibrated for 225/60R14), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 245/60R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.47 inches of ground clearance at the axle.

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