Tire Size Box

175/65R14 vs 175/70R14

175/70R14 compared with 175/65R14

+3.0% diameter, 0.0" width

175/70R14 is 23.65" 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 175/70R14 (dashed outline), drawn to scale

With 175/70R14 tires, when your speedometer says 60 mph you are really going

61.8 mph

175/70R14 is +0.69 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/65R14175/70R14Difference%
Overall diameter22.96"23.65"+0.69"+3.0%
Section width6.89"6.89"0.00"0.0%
Sidewall height4.48"4.82"+0.34"+7.7%
Circumference72.12"74.29"+2.16"+3.0%
Revolutions per mile878.5852.9−25.6−2.9%

Speedometer difference

If your vehicle came with 175/65R14 and you fit 175/70R14, 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, 175/65R14 or 175/70R14?
175/70R14 is taller by 0.69 inches (23.65" vs 22.96"). 175/65R14 is the same width.
Can I replace 175/65R14 with 175/70R14?
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 175/70R14 change my speedometer?
When your speedometer reads 60 mph with 175/70R14 fitted (calibrated for 175/65R14), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 175/70R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.34 inches of ground clearance at the axle.

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