Tire Size Box

175/80R15 vs 195/80R15

195/80R15 compared with 175/80R15

+4.8% diameter, +0.8" width

195/80R15 is 27.28" tall vs 26.02". More than the 3% rule of thumb, so check carefully before switching.

26.0"15" rim5.5"6.9" wide
175/80R15 (solid) compared with 195/80R15 (dashed outline), drawn to scale

With 195/80R15 tires, when your speedometer says 60 mph you are really going

62.9 mph

195/80R15 is +1.26 inches (+4.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/80R15195/80R15Difference%
Overall diameter26.02"27.28"+1.26"+4.8%
Section width6.89"7.68"+0.79"+11.4%
Sidewall height5.51"6.14"+0.63"+11.4%
Circumference81.76"85.71"+3.96"+4.8%
Revolutions per mile775.0739.2−35.8−4.6%

Speedometer difference

If your vehicle came with 175/80R15 and you fit 195/80R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.0 mph+1.0 mph
30 mph31.5 mph+1.5 mph
40 mph41.9 mph+1.9 mph
50 mph52.4 mph+2.4 mph
60 mph62.9 mph+2.9 mph
65 mph68.1 mph+3.1 mph
70 mph73.4 mph+3.4 mph
75 mph78.6 mph+3.6 mph
80 mph83.9 mph+3.9 mph

Each size on its own

Questions

Which is bigger, 175/80R15 or 195/80R15?
195/80R15 is taller by 1.26 inches (27.28" vs 26.02"). 195/80R15 is wider by 0.79 inches.
Can I replace 175/80R15 with 195/80R15?
It is not recommended without checking carefully. The diameter difference is +4.8%, 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 195/80R15 change my speedometer?
When your speedometer reads 60 mph with 195/80R15 fitted (calibrated for 175/80R15), your real speed is 62.9 mph. Your odometer will under-count miles by about 4.8%.
Will 195/80R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.63 inches of ground clearance at the axle.

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