Tire Size Box

275/75R18 vs 295/75R18

295/75R18 compared with 275/75R18

+3.4% diameter, +0.8" width

295/75R18 is 35.42" tall vs 34.24". More than the 3% rule of thumb, so check carefully before switching.

34.2"18" rim8.1"10.8" wide
275/75R18 (solid) compared with 295/75R18 (dashed outline), drawn to scale

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

62.1 mph

295/75R18 is +1.18 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/75R18295/75R18Difference%
Overall diameter34.24"35.42"+1.18"+3.4%
Section width10.83"11.61"+0.79"+7.3%
Sidewall height8.12"8.71"+0.59"+7.3%
Circumference107.57"111.28"+3.71"+3.4%
Revolutions per mile589.0569.4−19.6−3.3%

Speedometer difference

If your vehicle came with 275/75R18 and you fit 295/75R18, 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 mph67.2 mph+2.2 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, 275/75R18 or 295/75R18?
295/75R18 is taller by 1.18 inches (35.42" vs 34.24"). 295/75R18 is wider by 0.79 inches.
Can I replace 275/75R18 with 295/75R18?
It is not recommended without checking carefully. The diameter difference is +3.4%, 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 275/75R18), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.4%.
Will 295/75R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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