Tire Size Box

295/65R18 vs 295/75R18

295/75R18 compared with 295/65R18

+7.0% diameter, 0.0" width

295/75R18 is 35.42" tall vs 33.10". More than the 3% rule of thumb, so check carefully before switching.

33.1"18" rim7.5"11.6" wide
295/65R18 (solid) compared with 295/75R18 (dashed outline), drawn to scale

With 295/75R18 tires, when your speedometer says 60 mph you are really going

64.2 mph

295/75R18 is +2.32 inches (+7.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/65R18295/75R18Difference%
Overall diameter33.10"35.42"+2.32"+7.0%
Section width11.61"11.61"0.00"0.0%
Sidewall height7.55"8.71"+1.16"+15.4%
Circumference103.98"111.28"+7.30"+7.0%
Revolutions per mile609.3569.4−40.0−6.6%

Speedometer difference

If your vehicle came with 295/65R18 and you fit 295/75R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.1 mph+2.1 mph
40 mph42.8 mph+2.8 mph
50 mph53.5 mph+3.5 mph
60 mph64.2 mph+4.2 mph
65 mph69.6 mph+4.6 mph
70 mph74.9 mph+4.9 mph
75 mph80.3 mph+5.3 mph
80 mph85.6 mph+5.6 mph

Each size on its own

Questions

Which is bigger, 295/65R18 or 295/75R18?
295/75R18 is taller by 2.32 inches (35.42" vs 33.10"). 295/65R18 is the same width.
Can I replace 295/65R18 with 295/75R18?
It is not recommended without checking carefully. The diameter difference is +7.0%, 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 295/75R18 change my speedometer?
When your speedometer reads 60 mph with 295/75R18 fitted (calibrated for 295/65R18), your real speed is 64.2 mph. Your odometer will under-count miles by about 7.0%.
Will 295/75R18 lift my vehicle?
Ride height changes by half the diameter difference: +1.16 inches of ground clearance at the axle.

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