Tire Size Box

225/65R14 vs 225/75R14

225/75R14 compared with 225/65R14

+6.9% diameter, 0.0" width

225/75R14 is 27.29" tall vs 25.52". More than the 3% rule of thumb, so check carefully before switching.

25.5"14" rim5.8"8.9" wide
225/65R14 (solid) compared with 225/75R14 (dashed outline), drawn to scale

With 225/75R14 tires, when your speedometer says 60 mph you are really going

64.2 mph

225/75R14 is +1.77 inches (+6.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/65R14225/75R14Difference%
Overall diameter25.52"27.29"+1.77"+6.9%
Section width8.86"8.86"0.00"0.0%
Sidewall height5.76"6.64"+0.89"+15.4%
Circumference80.16"85.73"+5.57"+6.9%
Revolutions per mile790.4739.1−51.3−6.5%

Speedometer difference

If your vehicle came with 225/65R14 and you fit 225/75R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.1 mph+2.1 mph
40 mph42.8 mph+2.8 mph
50 mph53.5 mph+3.5 mph
60 mph64.2 mph+4.2 mph
65 mph69.5 mph+4.5 mph
70 mph74.9 mph+4.9 mph
75 mph80.2 mph+5.2 mph
80 mph85.6 mph+5.6 mph

Each size on its own

Questions

Which is bigger, 225/65R14 or 225/75R14?
225/75R14 is taller by 1.77 inches (27.29" vs 25.52"). 225/65R14 is the same width.
Can I replace 225/65R14 with 225/75R14?
It is not recommended without checking carefully. The diameter difference is +6.9%, 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 225/75R14 change my speedometer?
When your speedometer reads 60 mph with 225/75R14 fitted (calibrated for 225/65R14), your real speed is 64.2 mph. Your odometer will under-count miles by about 6.9%.
Will 225/75R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.89 inches of ground clearance at the axle.

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