Tire Size Box

225/80R13 vs 225/85R13

225/85R13 compared with 225/80R13

+3.3% diameter, 0.0" width

225/85R13 is 28.06" tall vs 27.17". More than the 3% rule of thumb, so check carefully before switching.

27.2"13" rim7.1"8.9" wide
225/80R13 (solid) compared with 225/85R13 (dashed outline), drawn to scale

With 225/85R13 tires, when your speedometer says 60 mph you are really going

62.0 mph

225/85R13 is +0.89 inches (+3.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/80R13225/85R13Difference%
Overall diameter27.17"28.06"+0.89"+3.3%
Section width8.86"8.86"0.00"0.0%
Sidewall height7.09"7.53"+0.44"+6.3%
Circumference85.37"88.15"+2.78"+3.3%
Revolutions per mile742.2718.8−23.4−3.2%

Speedometer difference

If your vehicle came with 225/80R13 and you fit 225/85R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph62.0 mph+2.0 mph
65 mph67.1 mph+2.1 mph
70 mph72.3 mph+2.3 mph
75 mph77.4 mph+2.4 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 225/80R13 or 225/85R13?
225/85R13 is taller by 0.89 inches (28.06" vs 27.17"). 225/80R13 is the same width.
Can I replace 225/80R13 with 225/85R13?
It is not recommended without checking carefully. The diameter difference is +3.3%, 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 225/85R13 change my speedometer?
When your speedometer reads 60 mph with 225/85R13 fitted (calibrated for 225/80R13), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.3%.
Will 225/85R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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