Tire Size Box

175/75R15 vs 195/75R15

195/75R15 compared with 175/75R15

+4.7% diameter, +0.8" width

195/75R15 is 26.52" tall vs 25.33". More than the 3% rule of thumb, so check carefully before switching.

25.3"15" rim5.2"6.9" wide
175/75R15 (solid) compared with 195/75R15 (dashed outline), drawn to scale

With 195/75R15 tires, when your speedometer says 60 mph you are really going

62.8 mph

195/75R15 is +1.18 inches (+4.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/75R15195/75R15Difference%
Overall diameter25.33"26.52"+1.18"+4.7%
Section width6.89"7.68"+0.79"+11.4%
Sidewall height5.17"5.76"+0.59"+11.4%
Circumference79.59"83.30"+3.71"+4.7%
Revolutions per mile796.1760.6−35.5−4.5%

Speedometer difference

If your vehicle came with 175/75R15 and you fit 195/75R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.4 mph+1.4 mph
40 mph41.9 mph+1.9 mph
50 mph52.3 mph+2.3 mph
60 mph62.8 mph+2.8 mph
65 mph68.0 mph+3.0 mph
70 mph73.3 mph+3.3 mph
75 mph78.5 mph+3.5 mph
80 mph83.7 mph+3.7 mph

Each size on its own

Questions

Which is bigger, 175/75R15 or 195/75R15?
195/75R15 is taller by 1.18 inches (26.52" vs 25.33"). 195/75R15 is wider by 0.79 inches.
Can I replace 175/75R15 with 195/75R15?
It is not recommended without checking carefully. The diameter difference is +4.7%, 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 195/75R15 change my speedometer?
When your speedometer reads 60 mph with 195/75R15 fitted (calibrated for 175/75R15), your real speed is 62.8 mph. Your odometer will under-count miles by about 4.7%.
Will 195/75R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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