Tire Size Box

275/70R18 vs 295/70R18

295/70R18 compared with 275/70R18

+3.3% diameter, +0.8" width

295/70R18 is 34.26" tall vs 33.16". More than the 3% rule of thumb, so check carefully before switching.

33.2"18" rim7.6"10.8" wide
275/70R18 (solid) compared with 295/70R18 (dashed outline), drawn to scale

With 295/70R18 tires, when your speedometer says 60 mph you are really going

62.0 mph

295/70R18 is +1.10 inches (+3.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/70R18295/70R18Difference%
Overall diameter33.16"34.26"+1.10"+3.3%
Section width10.83"11.61"+0.79"+7.3%
Sidewall height7.58"8.13"+0.55"+7.3%
Circumference104.17"107.63"+3.46"+3.3%
Revolutions per mile608.3588.7−19.6−3.2%

Speedometer difference

If your vehicle came with 275/70R18 and you fit 295/70R18, 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 mph51.7 mph+1.7 mph
60 mph62.0 mph+2.0 mph
65 mph67.2 mph+2.2 mph
70 mph72.3 mph+2.3 mph
75 mph77.5 mph+2.5 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 275/70R18 or 295/70R18?
295/70R18 is taller by 1.10 inches (34.26" vs 33.16"). 295/70R18 is wider by 0.79 inches.
Can I replace 275/70R18 with 295/70R18?
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 295/70R18 change my speedometer?
When your speedometer reads 60 mph with 295/70R18 fitted (calibrated for 275/70R18), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.3%.
Will 295/70R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.55 inches of ground clearance at the axle.

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