Tire Size Box

215/65R13 vs 235/65R13

235/65R13 compared with 215/65R13

+4.3% diameter, +0.8" width

235/65R13 is 25.03" tall vs 24.00". More than the 3% rule of thumb, so check carefully before switching.

24.0"13" rim5.5"8.5" wide
215/65R13 (solid) compared with 235/65R13 (dashed outline), drawn to scale

With 235/65R13 tires, when your speedometer says 60 mph you are really going

62.6 mph

235/65R13 is +1.02 inches (+4.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/65R13235/65R13Difference%
Overall diameter24.00"25.03"+1.02"+4.3%
Section width8.46"9.25"+0.79"+9.3%
Sidewall height5.50"6.01"+0.51"+9.3%
Circumference75.41"78.63"+3.22"+4.3%
Revolutions per mile840.2805.8−34.4−4.1%

Speedometer difference

If your vehicle came with 215/65R13 and you fit 235/65R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.3 mph+1.3 mph
40 mph41.7 mph+1.7 mph
50 mph52.1 mph+2.1 mph
60 mph62.6 mph+2.6 mph
65 mph67.8 mph+2.8 mph
70 mph73.0 mph+3.0 mph
75 mph78.2 mph+3.2 mph
80 mph83.4 mph+3.4 mph

Each size on its own

Questions

Which is bigger, 215/65R13 or 235/65R13?
235/65R13 is taller by 1.02 inches (25.03" vs 24.00"). 235/65R13 is wider by 0.79 inches.
Can I replace 215/65R13 with 235/65R13?
It is not recommended without checking carefully. The diameter difference is +4.3%, 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 235/65R13 change my speedometer?
When your speedometer reads 60 mph with 235/65R13 fitted (calibrated for 215/65R13), your real speed is 62.6 mph. Your odometer will under-count miles by about 4.3%.
Will 235/65R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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