Tire Size Box

245/65R16 vs 245/75R16

245/75R16 compared with 245/65R16

+6.8% diameter, 0.0" width

245/75R16 is 30.47" tall vs 28.54". More than the 3% rule of thumb, so check carefully before switching.

28.5"16" rim6.3"9.6" wide
245/65R16 (solid) compared with 245/75R16 (dashed outline), drawn to scale

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

64.1 mph

245/75R16 is +1.93 inches (+6.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/65R16245/75R16Difference%
Overall diameter28.54"30.47"+1.93"+6.8%
Section width9.65"9.65"0.00"0.0%
Sidewall height6.27"7.23"+0.96"+15.4%
Circumference89.66"95.72"+6.06"+6.8%
Revolutions per mile706.7661.9−44.7−6.3%

Speedometer difference

If your vehicle came with 245/65R16 and you fit 245/75R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.0 mph+2.0 mph
40 mph42.7 mph+2.7 mph
50 mph53.4 mph+3.4 mph
60 mph64.1 mph+4.1 mph
65 mph69.4 mph+4.4 mph
70 mph74.7 mph+4.7 mph
75 mph80.1 mph+5.1 mph
80 mph85.4 mph+5.4 mph

Each size on its own

Questions

Which is bigger, 245/65R16 or 245/75R16?
245/75R16 is taller by 1.93 inches (30.47" vs 28.54"). 245/65R16 is the same width.
Can I replace 245/65R16 with 245/75R16?
It is not recommended without checking carefully. The diameter difference is +6.8%, 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 245/65R16), your real speed is 64.1 mph. Your odometer will under-count miles by about 6.8%.
Will 245/75R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.96 inches of ground clearance at the axle.

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