Tire Size Box

335/30R20 vs 335/35R20

335/35R20 compared with 335/30R20

+4.7% diameter, 0.0" width

335/35R20 is 29.23" tall vs 27.91". More than the 3% rule of thumb, so check carefully before switching.

27.9"20" rim4.0"13.2" wide
335/30R20 (solid) compared with 335/35R20 (dashed outline), drawn to scale

With 335/35R20 tires, when your speedometer says 60 mph you are really going

62.8 mph

335/35R20 is +1.32 inches (+4.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/30R20335/35R20Difference%
Overall diameter27.91"29.23"+1.32"+4.7%
Section width13.19"13.19"0.00"0.0%
Sidewall height3.96"4.62"+0.66"+16.7%
Circumference87.69"91.84"+4.14"+4.7%
Revolutions per mile722.5689.9−32.6−4.5%

Speedometer difference

If your vehicle came with 335/30R20 and you fit 335/35R20, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.4 mph+1.4 mph
40 mph41.9 mph+1.9 mph
50 mph52.4 mph+2.4 mph
60 mph62.8 mph+2.8 mph
65 mph68.1 mph+3.1 mph
70 mph73.3 mph+3.3 mph
75 mph78.5 mph+3.5 mph
80 mph83.8 mph+3.8 mph

Each size on its own

Questions

Which is bigger, 335/30R20 or 335/35R20?
335/35R20 is taller by 1.32 inches (29.23" vs 27.91"). 335/30R20 is the same width.
Can I replace 335/30R20 with 335/35R20?
It is not recommended without checking carefully. The diameter difference is +4.7%, 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 335/35R20 change my speedometer?
When your speedometer reads 60 mph with 335/35R20 fitted (calibrated for 335/30R20), your real speed is 62.8 mph. Your odometer will under-count miles by about 4.7%.
Will 335/35R20 lift my vehicle?
Ride height changes by half the diameter difference: +0.66 inches of ground clearance at the axle.

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