Tire Size Box

195/65R15 vs 195/75R15

195/75R15 compared with 195/65R15

+6.1% diameter, 0.0" width

195/75R15 is 26.52" tall vs 24.98". More than the 3% rule of thumb, so check carefully before switching.

25.0"15" rim5.0"7.7" wide
195/65R15 (solid) compared with 195/75R15 (dashed outline), drawn to scale

With 195/75R15 tires, when your speedometer says 60 mph you are really going

63.7 mph

195/75R15 is +1.54 inches (+6.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/65R15195/75R15Difference%
Overall diameter24.98"26.52"+1.54"+6.1%
Section width7.68"7.68"0.00"0.0%
Sidewall height4.99"5.76"+0.77"+15.4%
Circumference78.48"83.30"+4.82"+6.1%
Revolutions per mile807.4760.6−46.8−5.8%

Speedometer difference

If your vehicle came with 195/65R15 and you fit 195/75R15, 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 mph42.5 mph+2.5 mph
50 mph53.1 mph+3.1 mph
60 mph63.7 mph+3.7 mph
65 mph69.0 mph+4.0 mph
70 mph74.3 mph+4.3 mph
75 mph79.6 mph+4.6 mph
80 mph84.9 mph+4.9 mph

Each size on its own

Questions

Which is bigger, 195/65R15 or 195/75R15?
195/75R15 is taller by 1.54 inches (26.52" vs 24.98"). 195/65R15 is the same width.
Can I replace 195/65R15 with 195/75R15?
It is not recommended without checking carefully. The diameter difference is +6.1%, 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 195/75R15 change my speedometer?
When your speedometer reads 60 mph with 195/75R15 fitted (calibrated for 195/65R15), your real speed is 63.7 mph. Your odometer will under-count miles by about 6.1%.
Will 195/75R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.77 inches of ground clearance at the axle.

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