Tire Size Box

335/25R20 vs 335/35R20

335/35R20 compared with 335/25R20

+9.9% diameter, 0.0" width

335/35R20 is 29.23" tall vs 26.59". More than the 3% rule of thumb, so check carefully before switching.

26.6"20" rim3.3"13.2" wide
335/25R20 (solid) compared with 335/35R20 (dashed outline), drawn to scale

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

66.0 mph

335/35R20 is +2.64 inches (+9.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/25R20335/35R20Difference%
Overall diameter26.59"29.23"+2.64"+9.9%
Section width13.19"13.19"0.00"0.0%
Sidewall height3.30"4.62"+1.32"+40.0%
Circumference83.55"91.84"+8.29"+9.9%
Revolutions per mile758.4689.9−68.4−9.0%

Speedometer difference

If your vehicle came with 335/25R20 and you fit 335/35R20, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph22.0 mph+2.0 mph
30 mph33.0 mph+3.0 mph
40 mph44.0 mph+4.0 mph
50 mph55.0 mph+5.0 mph
60 mph66.0 mph+6.0 mph
65 mph71.4 mph+6.4 mph
70 mph76.9 mph+6.9 mph
75 mph82.4 mph+7.4 mph
80 mph87.9 mph+7.9 mph

Each size on its own

Questions

Which is bigger, 335/25R20 or 335/35R20?
335/35R20 is taller by 2.64 inches (29.23" vs 26.59"). 335/25R20 is the same width.
Can I replace 335/25R20 with 335/35R20?
It is not recommended without checking carefully. The diameter difference is +9.9%, 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 335/25R20), your real speed is 66.0 mph. Your odometer will under-count miles by about 9.9%.
Will 335/35R20 lift my vehicle?
Ride height changes by half the diameter difference: +1.32 inches of ground clearance at the axle.

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