Tire Size Box

215/70R15 vs 215/75R15

215/75R15 compared with 215/70R15

+3.2% diameter, 0.0" width

215/75R15 is 27.70" tall vs 26.85". More than the 3% rule of thumb, so check carefully before switching.

26.9"15" rim5.9"8.5" wide
215/70R15 (solid) compared with 215/75R15 (dashed outline), drawn to scale

With 215/75R15 tires, when your speedometer says 60 mph you are really going

61.9 mph

215/75R15 is +0.85 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/70R15215/75R15Difference%
Overall diameter26.85"27.70"+0.85"+3.2%
Section width8.46"8.46"0.00"0.0%
Sidewall height5.93"6.35"+0.42"+7.1%
Circumference84.35"87.01"+2.66"+3.2%
Revolutions per mile751.1728.2−23.0−3.1%

Speedometer difference

If your vehicle came with 215/70R15 and you fit 215/75R15, 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 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.0 mph+2.0 mph
70 mph72.2 mph+2.2 mph
75 mph77.4 mph+2.4 mph
80 mph82.5 mph+2.5 mph

Each size on its own

Questions

Which is bigger, 215/70R15 or 215/75R15?
215/75R15 is taller by 0.85 inches (27.70" vs 26.85"). 215/70R15 is the same width.
Can I replace 215/70R15 with 215/75R15?
It is not recommended without checking carefully. The diameter difference is +3.2%, 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 215/75R15 change my speedometer?
When your speedometer reads 60 mph with 215/75R15 fitted (calibrated for 215/70R15), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 215/75R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.42 inches of ground clearance at the axle.

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