Tire Size Box

275/35R19 vs 275/40R19

275/40R19 compared with 275/35R19

+4.1% diameter, 0.0" width

275/40R19 is 27.66" tall vs 26.58". More than the 3% rule of thumb, so check carefully before switching.

26.6"19" rim3.8"10.8" wide
275/35R19 (solid) compared with 275/40R19 (dashed outline), drawn to scale

With 275/40R19 tires, when your speedometer says 60 mph you are really going

62.4 mph

275/40R19 is +1.08 inches (+4.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/35R19275/40R19Difference%
Overall diameter26.58"27.66"+1.08"+4.1%
Section width10.83"10.83"0.00"0.0%
Sidewall height3.79"4.33"+0.54"+14.3%
Circumference83.50"86.90"+3.40"+4.1%
Revolutions per mile758.8729.1−29.7−3.9%

Speedometer difference

If your vehicle came with 275/35R19 and you fit 275/40R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.9 mph+2.9 mph
75 mph78.1 mph+3.1 mph
80 mph83.3 mph+3.3 mph

Each size on its own

Questions

Which is bigger, 275/35R19 or 275/40R19?
275/40R19 is taller by 1.08 inches (27.66" vs 26.58"). 275/35R19 is the same width.
Can I replace 275/35R19 with 275/40R19?
It is not recommended without checking carefully. The diameter difference is +4.1%, 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 275/40R19 change my speedometer?
When your speedometer reads 60 mph with 275/40R19 fitted (calibrated for 275/35R19), your real speed is 62.4 mph. Your odometer will under-count miles by about 4.1%.
Will 275/40R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

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