Tire Size Box

225/80R16 vs 245/80R16

245/80R16 compared with 225/80R16

+4.2% diameter, +0.8" width

245/80R16 is 31.43" tall vs 30.17". More than the 3% rule of thumb, so check carefully before switching.

30.2"16" rim7.1"8.9" wide
225/80R16 (solid) compared with 245/80R16 (dashed outline), drawn to scale

With 245/80R16 tires, when your speedometer says 60 mph you are really going

62.5 mph

245/80R16 is +1.26 inches (+4.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/80R16245/80R16Difference%
Overall diameter30.17"31.43"+1.26"+4.2%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height7.09"7.72"+0.63"+8.9%
Circumference94.79"98.75"+3.96"+4.2%
Revolutions per mile668.4641.6−26.8−4.0%

Speedometer difference

If your vehicle came with 225/80R16 and you fit 245/80R16, 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, 225/80R16 or 245/80R16?
245/80R16 is taller by 1.26 inches (31.43" vs 30.17"). 245/80R16 is wider by 0.79 inches.
Can I replace 225/80R16 with 245/80R16?
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 245/80R16 change my speedometer?
When your speedometer reads 60 mph with 245/80R16 fitted (calibrated for 225/80R16), your real speed is 62.5 mph. Your odometer will under-count miles by about 4.2%.
Will 245/80R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.63 inches of ground clearance at the axle.

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