Tire Size Box

225/70R16 vs 225/80R16

225/80R16 compared with 225/70R16

+6.2% diameter, 0.0" width

225/80R16 is 30.17" tall vs 28.40". More than the 3% rule of thumb, so check carefully before switching.

28.4"16" rim6.2"8.9" wide
225/70R16 (solid) compared with 225/80R16 (dashed outline), drawn to scale

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

63.7 mph

225/80R16 is +1.77 inches (+6.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/70R16225/80R16Difference%
Overall diameter28.40"30.17"+1.77"+6.2%
Section width8.86"8.86"0.00"0.0%
Sidewall height6.20"7.09"+0.89"+14.3%
Circumference89.23"94.79"+5.57"+6.2%
Revolutions per mile710.1668.4−41.7−5.9%

Speedometer difference

If your vehicle came with 225/70R16 and you fit 225/80R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.9 mph+1.9 mph
40 mph42.5 mph+2.5 mph
50 mph53.1 mph+3.1 mph
60 mph63.7 mph+3.7 mph
65 mph69.1 mph+4.1 mph
70 mph74.4 mph+4.4 mph
75 mph79.7 mph+4.7 mph
80 mph85.0 mph+5.0 mph

Each size on its own

Questions

Which is bigger, 225/70R16 or 225/80R16?
225/80R16 is taller by 1.77 inches (30.17" vs 28.40"). 225/70R16 is the same width.
Can I replace 225/70R16 with 225/80R16?
It is not recommended without checking carefully. The diameter difference is +6.2%, 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 225/80R16 change my speedometer?
When your speedometer reads 60 mph with 225/80R16 fitted (calibrated for 225/70R16), your real speed is 63.7 mph. Your odometer will under-count miles by about 6.2%.
Will 225/80R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.89 inches of ground clearance at the axle.

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