Tire Size Box

195/75R18 vs 215/75R18

215/75R18 compared with 195/75R18

+4.0% diameter, +0.8" width

215/75R18 is 30.70" tall vs 29.52". More than the 3% rule of thumb, so check carefully before switching.

29.5"18" rim5.8"7.7" wide
195/75R18 (solid) compared with 215/75R18 (dashed outline), drawn to scale

With 215/75R18 tires, when your speedometer says 60 mph you are really going

62.4 mph

215/75R18 is +1.18 inches (+4.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/75R18215/75R18Difference%
Overall diameter29.52"30.70"+1.18"+4.0%
Section width7.68"8.46"+0.79"+10.3%
Sidewall height5.76"6.35"+0.59"+10.3%
Circumference92.73"96.44"+3.71"+4.0%
Revolutions per mile683.3657.0−26.3−3.8%

Speedometer difference

If your vehicle came with 195/75R18 and you fit 215/75R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.8 mph+2.8 mph
75 mph78.0 mph+3.0 mph
80 mph83.2 mph+3.2 mph

Each size on its own

Questions

Which is bigger, 195/75R18 or 215/75R18?
215/75R18 is taller by 1.18 inches (30.70" vs 29.52"). 215/75R18 is wider by 0.79 inches.
Can I replace 195/75R18 with 215/75R18?
It is not recommended without checking carefully. The diameter difference is +4.0%, 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 215/75R18 change my speedometer?
When your speedometer reads 60 mph with 215/75R18 fitted (calibrated for 195/75R18), your real speed is 62.4 mph. Your odometer will under-count miles by about 4.0%.
Will 215/75R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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