Tire Size Box

175/70R15 vs 195/70R15

195/70R15 compared with 175/70R15

+4.5% diameter, +0.8" width

195/70R15 is 25.75" tall vs 24.65". More than the 3% rule of thumb, so check carefully before switching.

24.6"15" rim4.8"6.9" wide
175/70R15 (solid) compared with 195/70R15 (dashed outline), drawn to scale

With 195/70R15 tires, when your speedometer says 60 mph you are really going

62.7 mph

195/70R15 is +1.10 inches (+4.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

175/70R15195/70R15Difference%
Overall diameter24.65"25.75"+1.10"+4.5%
Section width6.89"7.68"+0.79"+11.4%
Sidewall height4.82"5.37"+0.55"+11.4%
Circumference77.43"80.89"+3.46"+4.5%
Revolutions per mile818.3783.3−35.0−4.3%

Speedometer difference

If your vehicle came with 175/70R15 and you fit 195/70R15, 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 mph41.8 mph+1.8 mph
50 mph52.2 mph+2.2 mph
60 mph62.7 mph+2.7 mph
65 mph67.9 mph+2.9 mph
70 mph73.1 mph+3.1 mph
75 mph78.4 mph+3.4 mph
80 mph83.6 mph+3.6 mph

Each size on its own

Questions

Which is bigger, 175/70R15 or 195/70R15?
195/70R15 is taller by 1.10 inches (25.75" vs 24.65"). 195/70R15 is wider by 0.79 inches.
Can I replace 175/70R15 with 195/70R15?
It is not recommended without checking carefully. The diameter difference is +4.5%, 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 195/70R15 change my speedometer?
When your speedometer reads 60 mph with 195/70R15 fitted (calibrated for 175/70R15), your real speed is 62.7 mph. Your odometer will under-count miles by about 4.5%.
Will 195/70R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.55 inches of ground clearance at the axle.

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