Tire Size Box

215/65R15 vs 215/75R15

215/75R15 compared with 215/65R15

+6.5% diameter, 0.0" width

215/75R15 is 27.70" tall vs 26.00". More than the 3% rule of thumb, so check carefully before switching.

26.0"15" rim5.5"8.5" wide
215/65R15 (solid) compared with 215/75R15 (dashed outline), drawn to scale

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

63.9 mph

215/75R15 is +1.69 inches (+6.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/65R15215/75R15Difference%
Overall diameter26.00"27.70"+1.69"+6.5%
Section width8.46"8.46"0.00"0.0%
Sidewall height5.50"6.35"+0.85"+15.4%
Circumference81.69"87.01"+5.32"+6.5%
Revolutions per mile775.6728.2−47.4−6.1%

Speedometer difference

If your vehicle came with 215/65R15 and you fit 215/75R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.3 mph+1.3 mph
30 mph32.0 mph+2.0 mph
40 mph42.6 mph+2.6 mph
50 mph53.3 mph+3.3 mph
60 mph63.9 mph+3.9 mph
65 mph69.2 mph+4.2 mph
70 mph74.6 mph+4.6 mph
75 mph79.9 mph+4.9 mph
80 mph85.2 mph+5.2 mph

Each size on its own

Questions

Which is bigger, 215/65R15 or 215/75R15?
215/75R15 is taller by 1.69 inches (27.70" vs 26.00"). 215/65R15 is the same width.
Can I replace 215/65R15 with 215/75R15?
It is not recommended without checking carefully. The diameter difference is +6.5%, 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 215/65R15), your real speed is 63.9 mph. Your odometer will under-count miles by about 6.5%.
Will 215/75R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.85 inches of ground clearance at the axle.

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