Tire Size Box

295/35R19 vs 285/40R19

285/40R19 compared with 295/35R19

+3.1% diameter, −0.4" width

285/40R19 is 27.98" tall vs 27.13". More than the 3% rule of thumb, so check carefully before switching.

27.1"19" rim4.1"11.6" wide
295/35R19 (solid) compared with 285/40R19 (dashed outline), drawn to scale

With 285/40R19 tires, when your speedometer says 60 mph you are really going

61.9 mph

285/40R19 is +0.85 inches (+3.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/35R19285/40R19Difference%
Overall diameter27.13"27.98"+0.85"+3.1%
Section width11.61"11.22"−0.39"−3.4%
Sidewall height4.06"4.49"+0.42"+10.4%
Circumference85.23"87.89"+2.66"+3.1%
Revolutions per mile743.4720.9−22.5−3.0%

Speedometer difference

If your vehicle came with 295/35R19 and you fit 285/40R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.0 mph+2.0 mph
70 mph72.2 mph+2.2 mph
75 mph77.3 mph+2.3 mph
80 mph82.5 mph+2.5 mph

Each size on its own

Questions

Which is bigger, 295/35R19 or 285/40R19?
285/40R19 is taller by 0.85 inches (27.98" vs 27.13"). 295/35R19 is wider by 0.39 inches.
Can I replace 295/35R19 with 285/40R19?
It is not recommended without checking carefully. The diameter difference is +3.1%, 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 285/40R19 change my speedometer?
When your speedometer reads 60 mph with 285/40R19 fitted (calibrated for 295/35R19), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.1%.
Will 285/40R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.42 inches of ground clearance at the axle.

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