Tire Size Box

295/55R20 vs 295/60R20

295/60R20 compared with 295/55R20

+3.5% diameter, 0.0" width

295/60R20 is 33.94" tall vs 32.78". More than the 3% rule of thumb, so check carefully before switching.

32.8"20" rim6.4"11.6" wide
295/55R20 (solid) compared with 295/60R20 (dashed outline), drawn to scale

With 295/60R20 tires, when your speedometer says 60 mph you are really going

62.1 mph

295/60R20 is +1.16 inches (+3.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/55R20295/60R20Difference%
Overall diameter32.78"33.94"+1.16"+3.5%
Section width11.61"11.61"0.00"0.0%
Sidewall height6.39"6.97"+0.58"+9.1%
Circumference102.97"106.62"+3.65"+3.5%
Revolutions per mile615.3594.3−21.1−3.4%

Speedometer difference

If your vehicle came with 295/55R20 and you fit 295/60R20, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.8 mph+2.8 mph

Each size on its own

Questions

Which is bigger, 295/55R20 or 295/60R20?
295/60R20 is taller by 1.16 inches (33.94" vs 32.78"). 295/55R20 is the same width.
Can I replace 295/55R20 with 295/60R20?
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 295/60R20 change my speedometer?
When your speedometer reads 60 mph with 295/60R20 fitted (calibrated for 295/55R20), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.5%.
Will 295/60R20 lift my vehicle?
Ride height changes by half the diameter difference: +0.58 inches of ground clearance at the axle.

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