Tire Size Box

215/80R13 vs 215/85R13

215/85R13 compared with 215/80R13

+3.2% diameter, 0.0" width

215/85R13 is 27.39" tall vs 26.54". More than the 3% rule of thumb, so check carefully before switching.

26.5"13" rim6.8"8.5" wide
215/80R13 (solid) compared with 215/85R13 (dashed outline), drawn to scale

With 215/85R13 tires, when your speedometer says 60 mph you are really going

61.9 mph

215/85R13 is +0.85 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/80R13215/85R13Difference%
Overall diameter26.54"27.39"+0.85"+3.2%
Section width8.46"8.46"0.00"0.0%
Sidewall height6.77"7.19"+0.42"+6.3%
Circumference83.39"86.05"+2.66"+3.2%
Revolutions per mile759.8736.3−23.5−3.1%

Speedometer difference

If your vehicle came with 215/80R13 and you fit 215/85R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.1 mph+2.1 mph
70 mph72.2 mph+2.2 mph
75 mph77.4 mph+2.4 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 215/80R13 or 215/85R13?
215/85R13 is taller by 0.85 inches (27.39" vs 26.54"). 215/80R13 is the same width.
Can I replace 215/80R13 with 215/85R13?
It is not recommended without checking carefully. The diameter difference is +3.2%, 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 215/85R13 change my speedometer?
When your speedometer reads 60 mph with 215/85R13 fitted (calibrated for 215/80R13), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 215/85R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.42 inches of ground clearance at the axle.

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