Tire Size Box

225/75R16 vs 225/80R16

225/80R16 compared with 225/75R16

+3.0% diameter, 0.0" width

225/80R16 is 30.17" 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 225/80R16 (dashed outline), drawn to scale

With 225/80R16 tires, when your speedometer says 60 mph you are really going

61.8 mph

225/80R16 is +0.89 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/75R16225/80R16Difference%
Overall diameter29.29"30.17"+0.89"+3.0%
Section width8.86"8.86"0.00"0.0%
Sidewall height6.64"7.09"+0.44"+6.7%
Circumference92.01"94.79"+2.78"+3.0%
Revolutions per mile688.6668.4−20.2−2.9%

Speedometer difference

If your vehicle came with 225/75R16 and you fit 225/80R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.8 mph+1.8 mph
65 mph67.0 mph+2.0 mph
70 mph72.1 mph+2.1 mph
75 mph77.3 mph+2.3 mph
80 mph82.4 mph+2.4 mph

Each size on its own

Questions

Which is bigger, 225/75R16 or 225/80R16?
225/80R16 is taller by 0.89 inches (30.17" vs 29.29"). 225/75R16 is the same width.
Can I replace 225/75R16 with 225/80R16?
It is not recommended without checking carefully. The diameter difference is +3.0%, 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 225/80R16 change my speedometer?
When your speedometer reads 60 mph with 225/80R16 fitted (calibrated for 225/75R16), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 225/80R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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