Tire Size Box

275/35R22 vs 275/40R22

275/40R22 compared with 275/35R22

+3.7% diameter, 0.0" width

275/40R22 is 30.66" tall vs 29.58". More than the 3% rule of thumb, so check carefully before switching.

29.6"22" rim3.8"10.8" wide
275/35R22 (solid) compared with 275/40R22 (dashed outline), drawn to scale

With 275/40R22 tires, when your speedometer says 60 mph you are really going

62.2 mph

275/40R22 is +1.08 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/35R22275/40R22Difference%
Overall diameter29.58"30.66"+1.08"+3.7%
Section width10.83"10.83"0.00"0.0%
Sidewall height3.79"4.33"+0.54"+14.3%
Circumference92.92"96.33"+3.40"+3.7%
Revolutions per mile681.8657.8−24.1−3.5%

Speedometer difference

If your vehicle came with 275/35R22 and you fit 275/40R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 275/35R22 or 275/40R22?
275/40R22 is taller by 1.08 inches (30.66" vs 29.58"). 275/35R22 is the same width.
Can I replace 275/35R22 with 275/40R22?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 275/40R22 change my speedometer?
When your speedometer reads 60 mph with 275/40R22 fitted (calibrated for 275/35R22), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 275/40R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

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