Tire Size Box

245/70R16 vs 245/75R16

245/75R16 compared with 245/70R16

+3.3% diameter, 0.0" width

245/75R16 is 30.47" tall vs 29.50". More than the 3% rule of thumb, so check carefully before switching.

29.5"16" rim6.8"9.6" wide
245/70R16 (solid) compared with 245/75R16 (dashed outline), drawn to scale

With 245/75R16 tires, when your speedometer says 60 mph you are really going

62.0 mph

245/75R16 is +0.96 inches (+3.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/70R16245/75R16Difference%
Overall diameter29.50"30.47"+0.96"+3.3%
Section width9.65"9.65"0.00"0.0%
Sidewall height6.75"7.23"+0.48"+7.1%
Circumference92.69"95.72"+3.03"+3.3%
Revolutions per mile683.6661.9−21.6−3.2%

Speedometer difference

If your vehicle came with 245/70R16 and you fit 245/75R16, 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 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph62.0 mph+2.0 mph
65 mph67.1 mph+2.1 mph
70 mph72.3 mph+2.3 mph
75 mph77.5 mph+2.5 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 245/70R16 or 245/75R16?
245/75R16 is taller by 0.96 inches (30.47" vs 29.50"). 245/70R16 is the same width.
Can I replace 245/70R16 with 245/75R16?
It is not recommended without checking carefully. The diameter difference is +3.3%, 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 245/75R16 change my speedometer?
When your speedometer reads 60 mph with 245/75R16 fitted (calibrated for 245/70R16), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.3%.
Will 245/75R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.48 inches of ground clearance at the axle.

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