Tire Size Box

205/75R14 vs 205/85R14

205/85R14 compared with 205/75R14

+6.2% diameter, 0.0" width

205/85R14 is 27.72" tall vs 26.11". More than the 3% rule of thumb, so check carefully before switching.

26.1"14" rim6.1"8.1" wide
205/75R14 (solid) compared with 205/85R14 (dashed outline), drawn to scale

With 205/85R14 tires, when your speedometer says 60 mph you are really going

63.7 mph

205/85R14 is +1.61 inches (+6.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

205/75R14205/85R14Difference%
Overall diameter26.11"27.72"+1.61"+6.2%
Section width8.07"8.07"0.00"0.0%
Sidewall height6.05"6.86"+0.81"+13.3%
Circumference82.02"87.09"+5.07"+6.2%
Revolutions per mile772.5727.6−45.0−5.8%

Speedometer difference

If your vehicle came with 205/75R14 and you fit 205/85R14, 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 mph69.0 mph+4.0 mph
70 mph74.3 mph+4.3 mph
75 mph79.6 mph+4.6 mph
80 mph84.9 mph+4.9 mph

Each size on its own

Questions

Which is bigger, 205/75R14 or 205/85R14?
205/85R14 is taller by 1.61 inches (27.72" vs 26.11"). 205/75R14 is the same width.
Can I replace 205/75R14 with 205/85R14?
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 205/85R14 change my speedometer?
When your speedometer reads 60 mph with 205/85R14 fitted (calibrated for 205/75R14), your real speed is 63.7 mph. Your odometer will under-count miles by about 6.2%.
Will 205/85R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.81 inches of ground clearance at the axle.

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