Tire Size Box

235/60R13 vs 235/70R13

235/70R13 compared with 235/60R13

+7.7% diameter, 0.0" width

235/70R13 is 25.95" tall vs 24.10". More than the 3% rule of thumb, so check carefully before switching.

24.1"13" rim5.6"9.3" wide
235/60R13 (solid) compared with 235/70R13 (dashed outline), drawn to scale

With 235/70R13 tires, when your speedometer says 60 mph you are really going

64.6 mph

235/70R13 is +1.85 inches (+7.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

235/60R13235/70R13Difference%
Overall diameter24.10"25.95"+1.85"+7.7%
Section width9.25"9.25"0.00"0.0%
Sidewall height5.55"6.48"+0.93"+16.7%
Circumference75.72"81.53"+5.81"+7.7%
Revolutions per mile836.8777.1−59.7−7.1%

Speedometer difference

If your vehicle came with 235/60R13 and you fit 235/70R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.5 mph+1.5 mph
30 mph32.3 mph+2.3 mph
40 mph43.1 mph+3.1 mph
50 mph53.8 mph+3.8 mph
60 mph64.6 mph+4.6 mph
65 mph70.0 mph+5.0 mph
70 mph75.4 mph+5.4 mph
75 mph80.8 mph+5.8 mph
80 mph86.1 mph+6.1 mph

Each size on its own

Questions

Which is bigger, 235/60R13 or 235/70R13?
235/70R13 is taller by 1.85 inches (25.95" vs 24.10"). 235/60R13 is the same width.
Can I replace 235/60R13 with 235/70R13?
It is not recommended without checking carefully. The diameter difference is +7.7%, 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 235/70R13 change my speedometer?
When your speedometer reads 60 mph with 235/70R13 fitted (calibrated for 235/60R13), your real speed is 64.6 mph. Your odometer will under-count miles by about 7.7%.
Will 235/70R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.93 inches of ground clearance at the axle.

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