Tire Size Box

175/65R14 vs 175/75R14

175/75R14 compared with 175/65R14

+6.0% diameter, 0.0" width

175/75R14 is 24.33" tall vs 22.96". More than the 3% rule of thumb, so check carefully before switching.

23.0"14" rim4.5"6.9" wide
175/65R14 (solid) compared with 175/75R14 (dashed outline), drawn to scale

With 175/75R14 tires, when your speedometer says 60 mph you are really going

63.6 mph

175/75R14 is +1.38 inches (+6.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/65R14175/75R14Difference%
Overall diameter22.96"24.33"+1.38"+6.0%
Section width6.89"6.89"0.00"0.0%
Sidewall height4.48"5.17"+0.69"+15.4%
Circumference72.12"76.45"+4.33"+6.0%
Revolutions per mile878.5828.8−49.7−5.7%

Speedometer difference

If your vehicle came with 175/65R14 and you fit 175/75R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.8 mph+1.8 mph
40 mph42.4 mph+2.4 mph
50 mph53.0 mph+3.0 mph
60 mph63.6 mph+3.6 mph
65 mph68.9 mph+3.9 mph
70 mph74.2 mph+4.2 mph
75 mph79.5 mph+4.5 mph
80 mph84.8 mph+4.8 mph

Each size on its own

Questions

Which is bigger, 175/65R14 or 175/75R14?
175/75R14 is taller by 1.38 inches (24.33" vs 22.96"). 175/65R14 is the same width.
Can I replace 175/65R14 with 175/75R14?
It is not recommended without checking carefully. The diameter difference is +6.0%, 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 175/75R14 change my speedometer?
When your speedometer reads 60 mph with 175/75R14 fitted (calibrated for 175/65R14), your real speed is 63.6 mph. Your odometer will under-count miles by about 6.0%.
Will 175/75R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.69 inches of ground clearance at the axle.

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