Tire Size Box

165/65R14 vs 165/75R14

165/75R14 compared with 165/65R14

+5.8% diameter, 0.0" width

165/75R14 is 23.74" tall vs 22.44". More than the 3% rule of thumb, so check carefully before switching.

22.4"14" rim4.2"6.5" wide
165/65R14 (solid) compared with 165/75R14 (dashed outline), drawn to scale

With 165/75R14 tires, when your speedometer says 60 mph you are really going

63.5 mph

165/75R14 is +1.30 inches (+5.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

165/65R14165/75R14Difference%
Overall diameter22.44"23.74"+1.30"+5.8%
Section width6.50"6.50"0.00"0.0%
Sidewall height4.22"4.87"+0.65"+15.4%
Circumference70.51"74.59"+4.08"+5.8%
Revolutions per mile898.6849.4−49.2−5.5%

Speedometer difference

If your vehicle came with 165/65R14 and you fit 165/75R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.7 mph+1.7 mph
40 mph42.3 mph+2.3 mph
50 mph52.9 mph+2.9 mph
60 mph63.5 mph+3.5 mph
65 mph68.8 mph+3.8 mph
70 mph74.1 mph+4.1 mph
75 mph79.3 mph+4.3 mph
80 mph84.6 mph+4.6 mph

Each size on its own

Questions

Which is bigger, 165/65R14 or 165/75R14?
165/75R14 is taller by 1.30 inches (23.74" vs 22.44"). 165/65R14 is the same width.
Can I replace 165/65R14 with 165/75R14?
It is not recommended without checking carefully. The diameter difference is +5.8%, 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 165/75R14 change my speedometer?
When your speedometer reads 60 mph with 165/75R14 fitted (calibrated for 165/65R14), your real speed is 63.5 mph. Your odometer will under-count miles by about 5.8%.
Will 165/75R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.65 inches of ground clearance at the axle.

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