Tire Size Box

155/80R13 vs 175/80R13

175/80R13 compared with 155/80R13

+5.5% diameter, +0.8" width

175/80R13 is 24.02" tall vs 22.76". More than the 3% rule of thumb, so check carefully before switching.

22.8"13" rim4.9"6.1" wide
155/80R13 (solid) compared with 175/80R13 (dashed outline), drawn to scale

With 175/80R13 tires, when your speedometer says 60 mph you are really going

63.3 mph

175/80R13 is +1.26 inches (+5.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

155/80R13175/80R13Difference%
Overall diameter22.76"24.02"+1.26"+5.5%
Section width6.10"6.89"+0.79"+12.9%
Sidewall height4.88"5.51"+0.63"+12.9%
Circumference71.51"75.47"+3.96"+5.5%
Revolutions per mile886.0839.5−46.5−5.2%

Speedometer difference

If your vehicle came with 155/80R13 and you fit 175/80R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.1 mph+1.1 mph
30 mph31.7 mph+1.7 mph
40 mph42.2 mph+2.2 mph
50 mph52.8 mph+2.8 mph
60 mph63.3 mph+3.3 mph
65 mph68.6 mph+3.6 mph
70 mph73.9 mph+3.9 mph
75 mph79.2 mph+4.2 mph
80 mph84.4 mph+4.4 mph

Each size on its own

Questions

Which is bigger, 155/80R13 or 175/80R13?
175/80R13 is taller by 1.26 inches (24.02" vs 22.76"). 175/80R13 is wider by 0.79 inches.
Can I replace 155/80R13 with 175/80R13?
It is not recommended without checking carefully. The diameter difference is +5.5%, 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 175/80R13 change my speedometer?
When your speedometer reads 60 mph with 175/80R13 fitted (calibrated for 155/80R13), your real speed is 63.3 mph. Your odometer will under-count miles by about 5.5%.
Will 175/80R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.63 inches of ground clearance at the axle.

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