Tire Size Box

195/75R15 vs 195/85R15

195/85R15 compared with 195/75R15

+5.8% diameter, 0.0" width

195/85R15 is 28.05" tall vs 26.52". More than the 3% rule of thumb, so check carefully before switching.

26.5"15" rim5.8"7.7" wide
195/75R15 (solid) compared with 195/85R15 (dashed outline), drawn to scale

With 195/85R15 tires, when your speedometer says 60 mph you are really going

63.5 mph

195/85R15 is +1.54 inches (+5.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/75R15195/85R15Difference%
Overall diameter26.52"28.05"+1.54"+5.8%
Section width7.68"7.68"0.00"0.0%
Sidewall height5.76"6.53"+0.77"+13.3%
Circumference83.30"88.13"+4.82"+5.8%
Revolutions per mile760.6719.0−41.6−5.5%

Speedometer difference

If your vehicle came with 195/75R15 and you fit 195/85R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.7 mph+1.7 mph
40 mph42.3 mph+2.3 mph
50 mph52.9 mph+2.9 mph
60 mph63.5 mph+3.5 mph
65 mph68.8 mph+3.8 mph
70 mph74.1 mph+4.1 mph
75 mph79.3 mph+4.3 mph
80 mph84.6 mph+4.6 mph

Each size on its own

Questions

Which is bigger, 195/75R15 or 195/85R15?
195/85R15 is taller by 1.54 inches (28.05" vs 26.52"). 195/75R15 is the same width.
Can I replace 195/75R15 with 195/85R15?
It is not recommended without checking carefully. The diameter difference is +5.8%, 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 195/85R15 change my speedometer?
When your speedometer reads 60 mph with 195/85R15 fitted (calibrated for 195/75R15), your real speed is 63.5 mph. Your odometer will under-count miles by about 5.8%.
Will 195/85R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.77 inches of ground clearance at the axle.

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