Tire Size Box

295/70R17 vs 295/75R17

295/75R17 compared with 295/70R17

+3.5% diameter, 0.0" width

295/75R17 is 34.42" tall vs 33.26". More than the 3% rule of thumb, so check carefully before switching.

33.3"17" rim8.1"11.6" wide
295/70R17 (solid) compared with 295/75R17 (dashed outline), drawn to scale

With 295/75R17 tires, when your speedometer says 60 mph you are really going

62.1 mph

295/75R17 is +1.16 inches (+3.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/70R17295/75R17Difference%
Overall diameter33.26"34.42"+1.16"+3.5%
Section width11.61"11.61"0.00"0.0%
Sidewall height8.13"8.71"+0.58"+7.1%
Circumference104.49"108.14"+3.65"+3.5%
Revolutions per mile606.4585.9−20.5−3.4%

Speedometer difference

If your vehicle came with 295/70R17 and you fit 295/75R17, 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 mph67.3 mph+2.3 mph
70 mph72.4 mph+2.4 mph
75 mph77.6 mph+2.6 mph
80 mph82.8 mph+2.8 mph

Each size on its own

Questions

Which is bigger, 295/70R17 or 295/75R17?
295/75R17 is taller by 1.16 inches (34.42" vs 33.26"). 295/70R17 is the same width.
Can I replace 295/70R17 with 295/75R17?
It is not recommended without checking carefully. The diameter difference is +3.5%, 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 295/75R17 change my speedometer?
When your speedometer reads 60 mph with 295/75R17 fitted (calibrated for 295/70R17), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.5%.
Will 295/75R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.58 inches of ground clearance at the axle.

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