Tire Size Box

295/55R18 vs 295/60R18

295/60R18 compared with 295/55R18

+3.8% diameter, 0.0" width

295/60R18 is 31.94" tall vs 30.78". More than the 3% rule of thumb, so check carefully before switching.

30.8"18" rim6.4"11.6" wide
295/55R18 (solid) compared with 295/60R18 (dashed outline), drawn to scale

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

62.3 mph

295/60R18 is +1.16 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/55R18295/60R18Difference%
Overall diameter30.78"31.94"+1.16"+3.8%
Section width11.61"11.61"0.00"0.0%
Sidewall height6.39"6.97"+0.58"+9.1%
Circumference96.68"100.33"+3.65"+3.8%
Revolutions per mile655.3631.5−23.8−3.6%

Speedometer difference

If your vehicle came with 295/55R18 and you fit 295/60R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 295/55R18 or 295/60R18?
295/60R18 is taller by 1.16 inches (31.94" vs 30.78"). 295/55R18 is the same width.
Can I replace 295/55R18 with 295/60R18?
It is not recommended without checking carefully. The diameter difference is +3.8%, 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 295/60R18 change my speedometer?
When your speedometer reads 60 mph with 295/60R18 fitted (calibrated for 295/55R18), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 295/60R18 lift my vehicle?
Ride height changes by half the diameter difference: +0.58 inches of ground clearance at the axle.

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