Tire Size Box

205/65R13 vs 205/70R13

205/70R13 compared with 205/65R13

+3.4% diameter, 0.0" width

205/70R13 is 24.30" tall vs 23.49". More than the 3% rule of thumb, so check carefully before switching.

23.5"13" rim5.2"8.1" wide
205/65R13 (solid) compared with 205/70R13 (dashed outline), drawn to scale

With 205/70R13 tires, when your speedometer says 60 mph you are really going

62.1 mph

205/70R13 is +0.81 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

205/65R13205/70R13Difference%
Overall diameter23.49"24.30"+0.81"+3.4%
Section width8.07"8.07"0.00"0.0%
Sidewall height5.25"5.65"+0.40"+7.7%
Circumference73.80"76.34"+2.54"+3.4%
Revolutions per mile858.5830.0−28.5−3.3%

Speedometer difference

If your vehicle came with 205/65R13 and you fit 205/70R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.4 mph+1.4 mph
50 mph51.7 mph+1.7 mph
60 mph62.1 mph+2.1 mph
65 mph67.2 mph+2.2 mph
70 mph72.4 mph+2.4 mph
75 mph77.6 mph+2.6 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 205/65R13 or 205/70R13?
205/70R13 is taller by 0.81 inches (24.30" vs 23.49"). 205/65R13 is the same width.
Can I replace 205/65R13 with 205/70R13?
It is not recommended without checking carefully. The diameter difference is +3.4%, 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 205/70R13 change my speedometer?
When your speedometer reads 60 mph with 205/70R13 fitted (calibrated for 205/65R13), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.4%.
Will 205/70R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.40 inches of ground clearance at the axle.

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