Tire Size Box

195/60R18 vs 195/70R18

195/70R18 compared with 195/60R18

+5.6% diameter, 0.0" width

195/70R18 is 28.75" tall vs 27.21". More than the 3% rule of thumb, so check carefully before switching.

27.2"18" rim4.6"7.7" wide
195/60R18 (solid) compared with 195/70R18 (dashed outline), drawn to scale

With 195/70R18 tires, when your speedometer says 60 mph you are really going

63.4 mph

195/70R18 is +1.54 inches (+5.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/60R18195/70R18Difference%
Overall diameter27.21"28.75"+1.54"+5.6%
Section width7.68"7.68"0.00"0.0%
Sidewall height4.61"5.37"+0.77"+16.7%
Circumference85.49"90.31"+4.82"+5.6%
Revolutions per mile741.1701.5−39.6−5.3%

Speedometer difference

If your vehicle came with 195/60R18 and you fit 195/70R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.1 mph+1.1 mph
30 mph31.7 mph+1.7 mph
40 mph42.3 mph+2.3 mph
50 mph52.8 mph+2.8 mph
60 mph63.4 mph+3.4 mph
65 mph68.7 mph+3.7 mph
70 mph73.9 mph+3.9 mph
75 mph79.2 mph+4.2 mph
80 mph84.5 mph+4.5 mph

Each size on its own

Questions

Which is bigger, 195/60R18 or 195/70R18?
195/70R18 is taller by 1.54 inches (28.75" vs 27.21"). 195/60R18 is the same width.
Can I replace 195/60R18 with 195/70R18?
It is not recommended without checking carefully. The diameter difference is +5.6%, 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 195/70R18 change my speedometer?
When your speedometer reads 60 mph with 195/70R18 fitted (calibrated for 195/60R18), your real speed is 63.4 mph. Your odometer will under-count miles by about 5.6%.
Will 195/70R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.77 inches of ground clearance at the axle.

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