Tire Size Box

235/70R13 vs 235/75R13

235/75R13 compared with 235/70R13

+3.6% diameter, 0.0" width

235/75R13 is 26.88" tall vs 25.95". More than the 3% rule of thumb, so check carefully before switching.

26.0"13" rim6.5"9.3" wide
235/70R13 (solid) compared with 235/75R13 (dashed outline), drawn to scale

With 235/75R13 tires, when your speedometer says 60 mph you are really going

62.1 mph

235/75R13 is +0.93 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

235/70R13235/75R13Difference%
Overall diameter25.95"26.88"+0.93"+3.6%
Section width9.25"9.25"0.00"0.0%
Sidewall height6.48"6.94"+0.46"+7.1%
Circumference81.53"84.44"+2.91"+3.6%
Revolutions per mile777.1750.4−26.7−3.4%

Speedometer difference

If your vehicle came with 235/70R13 and you fit 235/75R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 235/70R13 or 235/75R13?
235/75R13 is taller by 0.93 inches (26.88" vs 25.95"). 235/70R13 is the same width.
Can I replace 235/70R13 with 235/75R13?
It is not recommended without checking carefully. The diameter difference is +3.6%, 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 235/75R13 change my speedometer?
When your speedometer reads 60 mph with 235/75R13 fitted (calibrated for 235/70R13), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.6%.
Will 235/75R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.46 inches of ground clearance at the axle.

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