Tire Size Box

205/75R13 vs 205/80R13

205/80R13 compared with 205/75R13

+3.2% diameter, 0.0" width

205/80R13 is 25.91" tall vs 25.11". More than the 3% rule of thumb, so check carefully before switching.

25.1"13" rim6.1"8.1" wide
205/75R13 (solid) compared with 205/80R13 (dashed outline), drawn to scale

With 205/80R13 tires, when your speedometer says 60 mph you are really going

61.9 mph

205/80R13 is +0.81 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

205/75R13205/80R13Difference%
Overall diameter25.11"25.91"+0.81"+3.2%
Section width8.07"8.07"0.00"0.0%
Sidewall height6.05"6.46"+0.40"+6.7%
Circumference78.87"81.41"+2.54"+3.2%
Revolutions per mile803.3778.3−25.0−3.1%

Speedometer difference

If your vehicle came with 205/75R13 and you fit 205/80R13, 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 mph72.3 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, 205/75R13 or 205/80R13?
205/80R13 is taller by 0.81 inches (25.91" vs 25.11"). 205/75R13 is the same width.
Can I replace 205/75R13 with 205/80R13?
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 205/80R13 change my speedometer?
When your speedometer reads 60 mph with 205/80R13 fitted (calibrated for 205/75R13), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 205/80R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.40 inches of ground clearance at the axle.

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