Tire Size Box

335/50R18 vs 335/60R18

335/60R18 compared with 335/50R18

+8.5% diameter, 0.0" width

335/60R18 is 33.83" tall vs 31.19". More than the 3% rule of thumb, so check carefully before switching.

31.2"18" rim6.6"13.2" wide
335/50R18 (solid) compared with 335/60R18 (dashed outline), drawn to scale

With 335/60R18 tires, when your speedometer says 60 mph you are really going

65.1 mph

335/60R18 is +2.64 inches (+8.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/50R18335/60R18Difference%
Overall diameter31.19"33.83"+2.64"+8.5%
Section width13.19"13.19"0.00"0.0%
Sidewall height6.59"7.91"+1.32"+20.0%
Circumference97.98"106.27"+8.29"+8.5%
Revolutions per mile646.6596.2−50.4−7.8%

Speedometer difference

If your vehicle came with 335/50R18 and you fit 335/60R18, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.7 mph+1.7 mph
30 mph32.5 mph+2.5 mph
40 mph43.4 mph+3.4 mph
50 mph54.2 mph+4.2 mph
60 mph65.1 mph+5.1 mph
65 mph70.5 mph+5.5 mph
70 mph75.9 mph+5.9 mph
75 mph81.3 mph+6.3 mph
80 mph86.8 mph+6.8 mph

Each size on its own

Questions

Which is bigger, 335/50R18 or 335/60R18?
335/60R18 is taller by 2.64 inches (33.83" vs 31.19"). 335/50R18 is the same width.
Can I replace 335/50R18 with 335/60R18?
It is not recommended without checking carefully. The diameter difference is +8.5%, 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 335/60R18 change my speedometer?
When your speedometer reads 60 mph with 335/60R18 fitted (calibrated for 335/50R18), your real speed is 65.1 mph. Your odometer will under-count miles by about 8.5%.
Will 335/60R18 lift my vehicle?
Ride height changes by half the diameter difference: +1.32 inches of ground clearance at the axle.

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