Tire Size Box

335/30R22 vs 335/40R22

335/40R22 compared with 335/30R22

+8.8% diameter, 0.0" width

335/40R22 is 32.55" tall vs 29.91". More than the 3% rule of thumb, so check carefully before switching.

29.9"22" rim4.0"13.2" wide
335/30R22 (solid) compared with 335/40R22 (dashed outline), drawn to scale

With 335/40R22 tires, when your speedometer says 60 mph you are really going

65.3 mph

335/40R22 is +2.64 inches (+8.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

335/30R22335/40R22Difference%
Overall diameter29.91"32.55"+2.64"+8.8%
Section width13.19"13.19"0.00"0.0%
Sidewall height3.96"5.28"+1.32"+33.3%
Circumference93.98"102.26"+8.29"+8.8%
Revolutions per mile674.2619.6−54.6−8.1%

Speedometer difference

If your vehicle came with 335/30R22 and you fit 335/40R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.8 mph+1.8 mph
30 mph32.6 mph+2.6 mph
40 mph43.5 mph+3.5 mph
50 mph54.4 mph+4.4 mph
60 mph65.3 mph+5.3 mph
65 mph70.7 mph+5.7 mph
70 mph76.2 mph+6.2 mph
75 mph81.6 mph+6.6 mph
80 mph87.1 mph+7.1 mph

Each size on its own

Questions

Which is bigger, 335/30R22 or 335/40R22?
335/40R22 is taller by 2.64 inches (32.55" vs 29.91"). 335/30R22 is the same width.
Can I replace 335/30R22 with 335/40R22?
It is not recommended without checking carefully. The diameter difference is +8.8%, 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 335/40R22 change my speedometer?
When your speedometer reads 60 mph with 335/40R22 fitted (calibrated for 335/30R22), your real speed is 65.3 mph. Your odometer will under-count miles by about 8.8%.
Will 335/40R22 lift my vehicle?
Ride height changes by half the diameter difference: +1.32 inches of ground clearance at the axle.

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