Tire Size Box

235/60R14 vs 235/70R14

235/70R14 compared with 235/60R14

+7.4% diameter, 0.0" width

235/70R14 is 26.95" tall vs 25.10". More than the 3% rule of thumb, so check carefully before switching.

25.1"14" rim5.6"9.3" wide
235/60R14 (solid) compared with 235/70R14 (dashed outline), drawn to scale

With 235/70R14 tires, when your speedometer says 60 mph you are really going

64.4 mph

235/70R14 is +1.85 inches (+7.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

235/60R14235/70R14Difference%
Overall diameter25.10"26.95"+1.85"+7.4%
Section width9.25"9.25"0.00"0.0%
Sidewall height5.55"6.48"+0.93"+16.7%
Circumference78.86"84.67"+5.81"+7.4%
Revolutions per mile803.4748.3−55.2−6.9%

Speedometer difference

If your vehicle came with 235/60R14 and you fit 235/70R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.5 mph+1.5 mph
30 mph32.2 mph+2.2 mph
40 mph42.9 mph+2.9 mph
50 mph53.7 mph+3.7 mph
60 mph64.4 mph+4.4 mph
65 mph69.8 mph+4.8 mph
70 mph75.2 mph+5.2 mph
75 mph80.5 mph+5.5 mph
80 mph85.9 mph+5.9 mph

Each size on its own

Questions

Which is bigger, 235/60R14 or 235/70R14?
235/70R14 is taller by 1.85 inches (26.95" vs 25.10"). 235/60R14 is the same width.
Can I replace 235/60R14 with 235/70R14?
It is not recommended without checking carefully. The diameter difference is +7.4%, 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 235/70R14 change my speedometer?
When your speedometer reads 60 mph with 235/70R14 fitted (calibrated for 235/60R14), your real speed is 64.4 mph. Your odometer will under-count miles by about 7.4%.
Will 235/70R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.93 inches of ground clearance at the axle.

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