Tire Size Box

225/55R19 vs 225/65R19

225/65R19 compared with 225/55R19

+6.2% diameter, 0.0" width

225/65R19 is 30.52" tall vs 28.74". More than the 3% rule of thumb, so check carefully before switching.

28.7"19" rim4.9"8.9" wide
225/55R19 (solid) compared with 225/65R19 (dashed outline), drawn to scale

With 225/65R19 tires, when your speedometer says 60 mph you are really going

63.7 mph

225/65R19 is +1.77 inches (+6.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/55R19225/65R19Difference%
Overall diameter28.74"30.52"+1.77"+6.2%
Section width8.86"8.86"0.00"0.0%
Sidewall height4.87"5.76"+0.89"+18.2%
Circumference90.30"95.87"+5.57"+6.2%
Revolutions per mile701.6660.9−40.7−5.8%

Speedometer difference

If your vehicle came with 225/55R19 and you fit 225/65R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.8 mph+1.8 mph
40 mph42.5 mph+2.5 mph
50 mph53.1 mph+3.1 mph
60 mph63.7 mph+3.7 mph
65 mph69.0 mph+4.0 mph
70 mph74.3 mph+4.3 mph
75 mph79.6 mph+4.6 mph
80 mph84.9 mph+4.9 mph

Each size on its own

Questions

Which is bigger, 225/55R19 or 225/65R19?
225/65R19 is taller by 1.77 inches (30.52" vs 28.74"). 225/55R19 is the same width.
Can I replace 225/55R19 with 225/65R19?
It is not recommended without checking carefully. The diameter difference is +6.2%, 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 225/65R19 change my speedometer?
When your speedometer reads 60 mph with 225/65R19 fitted (calibrated for 225/55R19), your real speed is 63.7 mph. Your odometer will under-count miles by about 6.2%.
Will 225/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.89 inches of ground clearance at the axle.

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