Tire Size Box

155/85R13 vs 175/85R13

175/85R13 compared with 155/85R13

+5.7% diameter, +0.8" width

175/85R13 is 24.71" tall vs 23.37". More than the 3% rule of thumb, so check carefully before switching.

23.4"13" rim5.2"6.1" wide
155/85R13 (solid) compared with 175/85R13 (dashed outline), drawn to scale

With 175/85R13 tires, when your speedometer says 60 mph you are really going

63.4 mph

175/85R13 is +1.34 inches (+5.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

155/85R13175/85R13Difference%
Overall diameter23.37"24.71"+1.34"+5.7%
Section width6.10"6.89"+0.79"+12.9%
Sidewall height5.19"5.86"+0.67"+12.9%
Circumference73.43"77.64"+4.21"+5.7%
Revolutions per mile862.8816.1−46.7−5.4%

Speedometer difference

If your vehicle came with 155/85R13 and you fit 175/85R13, 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 mph42.3 mph+2.3 mph
50 mph52.9 mph+2.9 mph
60 mph63.4 mph+3.4 mph
65 mph68.7 mph+3.7 mph
70 mph74.0 mph+4.0 mph
75 mph79.3 mph+4.3 mph
80 mph84.6 mph+4.6 mph

Each size on its own

Questions

Which is bigger, 155/85R13 or 175/85R13?
175/85R13 is taller by 1.34 inches (24.71" vs 23.37"). 175/85R13 is wider by 0.79 inches.
Can I replace 155/85R13 with 175/85R13?
It is not recommended without checking carefully. The diameter difference is +5.7%, 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 175/85R13 change my speedometer?
When your speedometer reads 60 mph with 175/85R13 fitted (calibrated for 155/85R13), your real speed is 63.4 mph. Your odometer will under-count miles by about 5.7%.
Will 175/85R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.67 inches of ground clearance at the axle.

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