Tire Size Box

225/75R16 vs 245/75R16

245/75R16 compared with 225/75R16

+4.0% diameter, +0.8" width

245/75R16 is 30.47" tall vs 29.29". More than the 3% rule of thumb, so check carefully before switching.

29.3"16" rim6.6"8.9" wide
225/75R16 (solid) compared with 245/75R16 (dashed outline), drawn to scale

With 245/75R16 tires, when your speedometer says 60 mph you are really going

62.4 mph

245/75R16 is +1.18 inches (+4.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/75R16245/75R16Difference%
Overall diameter29.29"30.47"+1.18"+4.0%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height6.64"7.23"+0.59"+8.9%
Circumference92.01"95.72"+3.71"+4.0%
Revolutions per mile688.6661.9−26.7−3.9%

Speedometer difference

If your vehicle came with 225/75R16 and you fit 245/75R16, 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 mph41.6 mph+1.6 mph
50 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.8 mph+2.8 mph
75 mph78.0 mph+3.0 mph
80 mph83.2 mph+3.2 mph

Each size on its own

Questions

Which is bigger, 225/75R16 or 245/75R16?
245/75R16 is taller by 1.18 inches (30.47" vs 29.29"). 245/75R16 is wider by 0.79 inches.
Can I replace 225/75R16 with 245/75R16?
It is not recommended without checking carefully. The diameter difference is +4.0%, 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 245/75R16 change my speedometer?
When your speedometer reads 60 mph with 245/75R16 fitted (calibrated for 225/75R16), your real speed is 62.4 mph. Your odometer will under-count miles by about 4.0%.
Will 245/75R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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