Tire Size Box

195/65R18 vs 215/65R18

215/65R18 compared with 195/65R18

+3.7% diameter, +0.8" width

215/65R18 is 29.00" tall vs 27.98". More than the 3% rule of thumb, so check carefully before switching.

28.0"18" rim5.0"7.7" wide
195/65R18 (solid) compared with 215/65R18 (dashed outline), drawn to scale

With 215/65R18 tires, when your speedometer says 60 mph you are really going

62.2 mph

215/65R18 is +1.02 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/65R18215/65R18Difference%
Overall diameter27.98"29.00"+1.02"+3.7%
Section width7.68"8.46"+0.79"+10.3%
Sidewall height4.99"5.50"+0.51"+10.3%
Circumference87.90"91.12"+3.22"+3.7%
Revolutions per mile720.8695.4−25.4−3.5%

Speedometer difference

If your vehicle came with 195/65R18 and you fit 215/65R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 195/65R18 or 215/65R18?
215/65R18 is taller by 1.02 inches (29.00" vs 27.98"). 215/65R18 is wider by 0.79 inches.
Can I replace 195/65R18 with 215/65R18?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 215/65R18 change my speedometer?
When your speedometer reads 60 mph with 215/65R18 fitted (calibrated for 195/65R18), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 215/65R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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