Tire Size Box

225/65R16 vs 245/65R16

245/65R16 compared with 225/65R16

+3.7% diameter, +0.8" width

245/65R16 is 28.54" tall vs 27.52". More than the 3% rule of thumb, so check carefully before switching.

27.5"16" rim5.8"8.9" wide
225/65R16 (solid) compared with 245/65R16 (dashed outline), drawn to scale

With 245/65R16 tires, when your speedometer says 60 mph you are really going

62.2 mph

245/65R16 is +1.02 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/65R16245/65R16Difference%
Overall diameter27.52"28.54"+1.02"+3.7%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height5.76"6.27"+0.51"+8.9%
Circumference86.44"89.66"+3.22"+3.7%
Revolutions per mile733.0706.7−26.3−3.6%

Speedometer difference

If your vehicle came with 225/65R16 and you fit 245/65R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 225/65R16 or 245/65R16?
245/65R16 is taller by 1.02 inches (28.54" vs 27.52"). 245/65R16 is wider by 0.79 inches.
Can I replace 225/65R16 with 245/65R16?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 245/65R16 change my speedometer?
When your speedometer reads 60 mph with 245/65R16 fitted (calibrated for 225/65R16), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 245/65R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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