Tire Size Box

225/65R19 vs 245/65R19

245/65R19 compared with 225/65R19

+3.4% diameter, +0.8" width

245/65R19 is 31.54" tall vs 30.52". More than the 3% rule of thumb, so check carefully before switching.

30.5"19" rim5.8"8.9" wide
225/65R19 (solid) compared with 245/65R19 (dashed outline), drawn to scale

With 245/65R19 tires, when your speedometer says 60 mph you are really going

62.0 mph

245/65R19 is +1.02 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/65R19245/65R19Difference%
Overall diameter30.52"31.54"+1.02"+3.4%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height5.76"6.27"+0.51"+8.9%
Circumference95.87"99.08"+3.22"+3.4%
Revolutions per mile660.9639.5−21.5−3.2%

Speedometer difference

If your vehicle came with 225/65R19 and you fit 245/65R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.7 mph+1.7 mph
60 mph62.0 mph+2.0 mph
65 mph67.2 mph+2.2 mph
70 mph72.3 mph+2.3 mph
75 mph77.5 mph+2.5 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 225/65R19 or 245/65R19?
245/65R19 is taller by 1.02 inches (31.54" vs 30.52"). 245/65R19 is wider by 0.79 inches.
Can I replace 225/65R19 with 245/65R19?
It is not recommended without checking carefully. The diameter difference is +3.4%, 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 245/65R19 change my speedometer?
When your speedometer reads 60 mph with 245/65R19 fitted (calibrated for 225/65R19), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.4%.
Will 245/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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