Tire Size Box

225/70R17 vs 225/75R17

225/75R17 compared with 225/70R17

+3.0% diameter, 0.0" width

225/75R17 is 30.29" tall vs 29.40". More than the 3% rule of thumb, so check carefully before switching.

29.4"17" rim6.2"8.9" wide
225/70R17 (solid) compared with 225/75R17 (dashed outline), drawn to scale

With 225/75R17 tires, when your speedometer says 60 mph you are really going

61.8 mph

225/75R17 is +0.89 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/70R17225/75R17Difference%
Overall diameter29.40"30.29"+0.89"+3.0%
Section width8.86"8.86"0.00"0.0%
Sidewall height6.20"6.64"+0.44"+7.1%
Circumference92.37"95.15"+2.78"+3.0%
Revolutions per mile686.0665.9−20.1−2.9%

Speedometer difference

If your vehicle came with 225/70R17 and you fit 225/75R17, 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, 225/70R17 or 225/75R17?
225/75R17 is taller by 0.89 inches (30.29" vs 29.40"). 225/70R17 is the same width.
Can I replace 225/70R17 with 225/75R17?
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 225/75R17 change my speedometer?
When your speedometer reads 60 mph with 225/75R17 fitted (calibrated for 225/70R17), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 225/75R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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