Tire Size Box

335/55R20 vs 335/60R20

335/60R20 compared with 335/55R20

+3.8% diameter, 0.0" width

335/60R20 is 35.83" tall vs 34.51". More than the 3% rule of thumb, so check carefully before switching.

34.5"20" rim7.3"13.2" wide
335/55R20 (solid) compared with 335/60R20 (dashed outline), drawn to scale

With 335/60R20 tires, when your speedometer says 60 mph you are really going

62.3 mph

335/60R20 is +1.32 inches (+3.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/55R20335/60R20Difference%
Overall diameter34.51"35.83"+1.32"+3.8%
Section width13.19"13.19"0.00"0.0%
Sidewall height7.25"7.91"+0.66"+9.1%
Circumference108.41"112.55"+4.14"+3.8%
Revolutions per mile584.4562.9−21.5−3.7%

Speedometer difference

If your vehicle came with 335/55R20 and you fit 335/60R20, 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 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 335/55R20 or 335/60R20?
335/60R20 is taller by 1.32 inches (35.83" vs 34.51"). 335/55R20 is the same width.
Can I replace 335/55R20 with 335/60R20?
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 335/60R20 change my speedometer?
When your speedometer reads 60 mph with 335/60R20 fitted (calibrated for 335/55R20), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.8%.
Will 335/60R20 lift my vehicle?
Ride height changes by half the diameter difference: +0.66 inches of ground clearance at the axle.

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