Tire Size Box

175/65R15 vs 195/65R15

195/65R15 compared with 175/65R15

+4.3% diameter, +0.8" width

195/65R15 is 24.98" tall vs 23.96". More than the 3% rule of thumb, so check carefully before switching.

24.0"15" rim4.5"6.9" wide
175/65R15 (solid) compared with 195/65R15 (dashed outline), drawn to scale

With 195/65R15 tires, when your speedometer says 60 mph you are really going

62.6 mph

195/65R15 is +1.02 inches (+4.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/65R15195/65R15Difference%
Overall diameter23.96"24.98"+1.02"+4.3%
Section width6.89"7.68"+0.79"+11.4%
Sidewall height4.48"4.99"+0.51"+11.4%
Circumference75.26"78.48"+3.22"+4.3%
Revolutions per mile841.9807.4−34.5−4.1%

Speedometer difference

If your vehicle came with 175/65R15 and you fit 195/65R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.1 mph+2.1 mph
60 mph62.6 mph+2.6 mph
65 mph67.8 mph+2.8 mph
70 mph73.0 mph+3.0 mph
75 mph78.2 mph+3.2 mph
80 mph83.4 mph+3.4 mph

Each size on its own

Questions

Which is bigger, 175/65R15 or 195/65R15?
195/65R15 is taller by 1.02 inches (24.98" vs 23.96"). 195/65R15 is wider by 0.79 inches.
Can I replace 175/65R15 with 195/65R15?
It is not recommended without checking carefully. The diameter difference is +4.3%, 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 195/65R15 change my speedometer?
When your speedometer reads 60 mph with 195/65R15 fitted (calibrated for 175/65R15), your real speed is 62.6 mph. Your odometer will under-count miles by about 4.3%.
Will 195/65R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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