Tire Size Box

205/70R13 vs 205/80R13

205/80R13 compared with 205/70R13

+6.6% diameter, 0.0" width

205/80R13 is 25.91" tall vs 24.30". More than the 3% rule of thumb, so check carefully before switching.

24.3"13" rim5.6"8.1" wide
205/70R13 (solid) compared with 205/80R13 (dashed outline), drawn to scale

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

64.0 mph

205/80R13 is +1.61 inches (+6.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

205/70R13205/80R13Difference%
Overall diameter24.30"25.91"+1.61"+6.6%
Section width8.07"8.07"0.00"0.0%
Sidewall height5.65"6.46"+0.81"+14.3%
Circumference76.34"81.41"+5.07"+6.6%
Revolutions per mile830.0778.3−51.7−6.2%

Speedometer difference

If your vehicle came with 205/70R13 and you fit 205/80R13, 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 mph42.7 mph+2.7 mph
50 mph53.3 mph+3.3 mph
60 mph64.0 mph+4.0 mph
65 mph69.3 mph+4.3 mph
70 mph74.7 mph+4.7 mph
75 mph80.0 mph+5.0 mph
80 mph85.3 mph+5.3 mph

Each size on its own

Questions

Which is bigger, 205/70R13 or 205/80R13?
205/80R13 is taller by 1.61 inches (25.91" vs 24.30"). 205/70R13 is the same width.
Can I replace 205/70R13 with 205/80R13?
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 205/80R13 change my speedometer?
When your speedometer reads 60 mph with 205/80R13 fitted (calibrated for 205/70R13), your real speed is 64.0 mph. Your odometer will under-count miles by about 6.6%.
Will 205/80R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.81 inches of ground clearance at the axle.

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