Tire Size Box

195/70R15 vs 195/80R15

195/80R15 compared with 195/70R15

+6.0% diameter, 0.0" width

195/80R15 is 27.28" tall vs 25.75". More than the 3% rule of thumb, so check carefully before switching.

25.7"15" rim5.4"7.7" wide
195/70R15 (solid) compared with 195/80R15 (dashed outline), drawn to scale

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

63.6 mph

195/80R15 is +1.54 inches (+6.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/70R15195/80R15Difference%
Overall diameter25.75"27.28"+1.54"+6.0%
Section width7.68"7.68"0.00"0.0%
Sidewall height5.37"6.14"+0.77"+14.3%
Circumference80.89"85.71"+4.82"+6.0%
Revolutions per mile783.3739.2−44.1−5.6%

Speedometer difference

If your vehicle came with 195/70R15 and you fit 195/80R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.8 mph+1.8 mph
40 mph42.4 mph+2.4 mph
50 mph53.0 mph+3.0 mph
60 mph63.6 mph+3.6 mph
65 mph68.9 mph+3.9 mph
70 mph74.2 mph+4.2 mph
75 mph79.5 mph+4.5 mph
80 mph84.8 mph+4.8 mph

Each size on its own

Questions

Which is bigger, 195/70R15 or 195/80R15?
195/80R15 is taller by 1.54 inches (27.28" vs 25.75"). 195/70R15 is the same width.
Can I replace 195/70R15 with 195/80R15?
It is not recommended without checking carefully. The diameter difference is +6.0%, 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 195/70R15), your real speed is 63.6 mph. Your odometer will under-count miles by about 6.0%.
Will 195/80R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.77 inches of ground clearance at the axle.

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