Tire Size Box

225/65R13 vs 225/70R13

225/70R13 compared with 225/65R13

+3.6% diameter, 0.0" width

225/70R13 is 25.40" tall vs 24.52". More than the 3% rule of thumb, so check carefully before switching.

24.5"13" rim5.8"8.9" wide
225/65R13 (solid) compared with 225/70R13 (dashed outline), drawn to scale

With 225/70R13 tires, when your speedometer says 60 mph you are really going

62.2 mph

225/70R13 is +0.89 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/65R13225/70R13Difference%
Overall diameter24.52"25.40"+0.89"+3.6%
Section width8.86"8.86"0.00"0.0%
Sidewall height5.76"6.20"+0.44"+7.7%
Circumference77.02"79.80"+2.78"+3.6%
Revolutions per mile822.7794.0−28.7−3.5%

Speedometer difference

If your vehicle came with 225/65R13 and you fit 225/70R13, 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 mph62.2 mph+2.2 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, 225/65R13 or 225/70R13?
225/70R13 is taller by 0.89 inches (25.40" vs 24.52"). 225/65R13 is the same width.
Can I replace 225/65R13 with 225/70R13?
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 225/70R13 change my speedometer?
When your speedometer reads 60 mph with 225/70R13 fitted (calibrated for 225/65R13), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.6%.
Will 225/70R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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