Tire Size Box

175/70R13 vs 175/75R13

175/75R13 compared with 175/70R13

+3.0% diameter, 0.0" width

175/75R13 is 23.33" tall vs 22.65". More than the 3% rule of thumb, so check carefully before switching.

22.6"13" rim4.8"6.9" wide
175/70R13 (solid) compared with 175/75R13 (dashed outline), drawn to scale

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

61.8 mph

175/75R13 is +0.69 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/70R13175/75R13Difference%
Overall diameter22.65"23.33"+0.69"+3.0%
Section width6.89"6.89"0.00"0.0%
Sidewall height4.82"5.17"+0.34"+7.1%
Circumference71.14"73.31"+2.16"+3.0%
Revolutions per mile890.6864.3−26.3−3.0%

Speedometer difference

If your vehicle came with 175/70R13 and you fit 175/75R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.8 mph+1.8 mph
65 mph67.0 mph+2.0 mph
70 mph72.1 mph+2.1 mph
75 mph77.3 mph+2.3 mph
80 mph82.4 mph+2.4 mph

Each size on its own

Questions

Which is bigger, 175/70R13 or 175/75R13?
175/75R13 is taller by 0.69 inches (23.33" vs 22.65"). 175/70R13 is the same width.
Can I replace 175/70R13 with 175/75R13?
It is not recommended without checking carefully. The diameter difference is +3.0%, 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 175/70R13), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 175/75R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.34 inches of ground clearance at the axle.

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