Tire Size Box

245/60R13 vs 245/70R13

245/70R13 compared with 245/60R13

+7.9% diameter, 0.0" width

245/70R13 is 26.50" tall vs 24.57". More than the 3% rule of thumb, so check carefully before switching.

24.6"13" rim5.8"9.6" wide
245/60R13 (solid) compared with 245/70R13 (dashed outline), drawn to scale

With 245/70R13 tires, when your speedometer says 60 mph you are really going

64.7 mph

245/70R13 is +1.93 inches (+7.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/60R13245/70R13Difference%
Overall diameter24.57"26.50"+1.93"+7.9%
Section width9.65"9.65"0.00"0.0%
Sidewall height5.79"6.75"+0.96"+16.7%
Circumference77.20"83.26"+6.06"+7.9%
Revolutions per mile820.7760.9−59.7−7.3%

Speedometer difference

If your vehicle came with 245/60R13 and you fit 245/70R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.6 mph+1.6 mph
30 mph32.4 mph+2.4 mph
40 mph43.1 mph+3.1 mph
50 mph53.9 mph+3.9 mph
60 mph64.7 mph+4.7 mph
65 mph70.1 mph+5.1 mph
70 mph75.5 mph+5.5 mph
75 mph80.9 mph+5.9 mph
80 mph86.3 mph+6.3 mph

Each size on its own

Questions

Which is bigger, 245/60R13 or 245/70R13?
245/70R13 is taller by 1.93 inches (26.50" vs 24.57"). 245/60R13 is the same width.
Can I replace 245/60R13 with 245/70R13?
It is not recommended without checking carefully. The diameter difference is +7.9%, 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 245/70R13 change my speedometer?
When your speedometer reads 60 mph with 245/70R13 fitted (calibrated for 245/60R13), your real speed is 64.7 mph. Your odometer will under-count miles by about 7.9%.
Will 245/70R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.96 inches of ground clearance at the axle.

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