Tire Size Box

225/35R19 vs 225/40R19

225/40R19 compared with 225/35R19

+3.5% diameter, 0.0" width

225/40R19 is 26.09" tall vs 25.20". More than the 3% rule of thumb, so check carefully before switching.

25.2"19" rim3.1"8.9" wide
225/35R19 (solid) compared with 225/40R19 (dashed outline), drawn to scale

With 225/40R19 tires, when your speedometer says 60 mph you are really going

62.1 mph

225/40R19 is +0.89 inches (+3.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/35R19225/40R19Difference%
Overall diameter25.20"26.09"+0.89"+3.5%
Section width8.86"8.86"0.00"0.0%
Sidewall height3.10"3.54"+0.44"+14.3%
Circumference79.17"81.95"+2.78"+3.5%
Revolutions per mile800.3773.1−27.2−3.4%

Speedometer difference

If your vehicle came with 225/35R19 and you fit 225/40R19, 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 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.6 mph+2.6 mph
80 mph82.8 mph+2.8 mph

Each size on its own

Questions

Which is bigger, 225/35R19 or 225/40R19?
225/40R19 is taller by 0.89 inches (26.09" vs 25.20"). 225/35R19 is the same width.
Can I replace 225/35R19 with 225/40R19?
It is not recommended without checking carefully. The diameter difference is +3.5%, 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 225/40R19 change my speedometer?
When your speedometer reads 60 mph with 225/40R19 fitted (calibrated for 225/35R19), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.5%.
Will 225/40R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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