Tire Size Box

245/65R13 vs 245/75R13

245/75R13 compared with 245/65R13

+7.6% diameter, 0.0" width

245/75R13 is 27.47" tall vs 25.54". More than the 3% rule of thumb, so check carefully before switching.

25.5"13" rim6.3"9.6" wide
245/65R13 (solid) compared with 245/75R13 (dashed outline), drawn to scale

With 245/75R13 tires, when your speedometer says 60 mph you are really going

64.5 mph

245/75R13 is +1.93 inches (+7.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/65R13245/75R13Difference%
Overall diameter25.54"27.47"+1.93"+7.6%
Section width9.65"9.65"0.00"0.0%
Sidewall height6.27"7.23"+0.96"+15.4%
Circumference80.23"86.29"+6.06"+7.6%
Revolutions per mile789.7734.2−55.5−7.0%

Speedometer difference

If your vehicle came with 245/65R13 and you fit 245/75R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.5 mph+1.5 mph
30 mph32.3 mph+2.3 mph
40 mph43.0 mph+3.0 mph
50 mph53.8 mph+3.8 mph
60 mph64.5 mph+4.5 mph
65 mph69.9 mph+4.9 mph
70 mph75.3 mph+5.3 mph
75 mph80.7 mph+5.7 mph
80 mph86.0 mph+6.0 mph

Each size on its own

Questions

Which is bigger, 245/65R13 or 245/75R13?
245/75R13 is taller by 1.93 inches (27.47" vs 25.54"). 245/65R13 is the same width.
Can I replace 245/65R13 with 245/75R13?
It is not recommended without checking carefully. The diameter difference is +7.6%, 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 245/75R13 change my speedometer?
When your speedometer reads 60 mph with 245/75R13 fitted (calibrated for 245/65R13), your real speed is 64.5 mph. Your odometer will under-count miles by about 7.6%.
Will 245/75R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.96 inches of ground clearance at the axle.

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