Tire Size Box

215/75R13 vs 215/85R13

215/85R13 compared with 215/75R13

+6.6% diameter, 0.0" width

215/85R13 is 27.39" tall vs 25.70". More than the 3% rule of thumb, so check carefully before switching.

25.7"13" rim6.3"8.5" wide
215/75R13 (solid) compared with 215/85R13 (dashed outline), drawn to scale

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

64.0 mph

215/85R13 is +1.69 inches (+6.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/75R13215/85R13Difference%
Overall diameter25.70"27.39"+1.69"+6.6%
Section width8.46"8.46"0.00"0.0%
Sidewall height6.35"7.19"+0.85"+13.3%
Circumference80.73"86.05"+5.32"+6.6%
Revolutions per mile784.8736.3−48.5−6.2%

Speedometer difference

If your vehicle came with 215/75R13 and you fit 215/85R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.3 mph+1.3 mph
30 mph32.0 mph+2.0 mph
40 mph42.6 mph+2.6 mph
50 mph53.3 mph+3.3 mph
60 mph64.0 mph+4.0 mph
65 mph69.3 mph+4.3 mph
70 mph74.6 mph+4.6 mph
75 mph79.9 mph+4.9 mph
80 mph85.3 mph+5.3 mph

Each size on its own

Questions

Which is bigger, 215/75R13 or 215/85R13?
215/85R13 is taller by 1.69 inches (27.39" vs 25.70"). 215/75R13 is the same width.
Can I replace 215/75R13 with 215/85R13?
It is not recommended without checking carefully. The diameter difference is +6.6%, 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 215/75R13), your real speed is 64.0 mph. Your odometer will under-count miles by about 6.6%.
Will 215/85R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.85 inches of ground clearance at the axle.

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