Tire Size Box

155/75R13 vs 175/75R13

175/75R13 compared with 155/75R13

+5.3% diameter, +0.8" width

175/75R13 is 23.33" tall vs 22.15". More than the 3% rule of thumb, so check carefully before switching.

22.2"13" rim4.6"6.1" wide
155/75R13 (solid) compared with 175/75R13 (dashed outline), drawn to scale

With 175/75R13 tires, when your speedometer says 60 mph you are really going

63.2 mph

175/75R13 is +1.18 inches (+5.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

155/75R13175/75R13Difference%
Overall diameter22.15"23.33"+1.18"+5.3%
Section width6.10"6.89"+0.79"+12.9%
Sidewall height4.58"5.17"+0.59"+12.9%
Circumference69.60"73.31"+3.71"+5.3%
Revolutions per mile910.4864.3−46.1−5.1%

Speedometer difference

If your vehicle came with 155/75R13 and you fit 175/75R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.1 mph+1.1 mph
30 mph31.6 mph+1.6 mph
40 mph42.1 mph+2.1 mph
50 mph52.7 mph+2.7 mph
60 mph63.2 mph+3.2 mph
65 mph68.5 mph+3.5 mph
70 mph73.7 mph+3.7 mph
75 mph79.0 mph+4.0 mph
80 mph84.3 mph+4.3 mph

Each size on its own

Questions

Which is bigger, 155/75R13 or 175/75R13?
175/75R13 is taller by 1.18 inches (23.33" vs 22.15"). 175/75R13 is wider by 0.79 inches.
Can I replace 155/75R13 with 175/75R13?
It is not recommended without checking carefully. The diameter difference is +5.3%, 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 175/75R13 change my speedometer?
When your speedometer reads 60 mph with 175/75R13 fitted (calibrated for 155/75R13), your real speed is 63.2 mph. Your odometer will under-count miles by about 5.3%.
Will 175/75R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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