Tire Size Box

245/55R19 vs 245/65R19

245/65R19 compared with 245/55R19

+6.5% diameter, 0.0" width

245/65R19 is 31.54" tall vs 29.61". More than the 3% rule of thumb, so check carefully before switching.

29.6"19" rim5.3"9.6" wide
245/55R19 (solid) compared with 245/65R19 (dashed outline), drawn to scale

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

63.9 mph

245/65R19 is +1.93 inches (+6.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/55R19245/65R19Difference%
Overall diameter29.61"31.54"+1.93"+6.5%
Section width9.65"9.65"0.00"0.0%
Sidewall height5.31"6.27"+0.96"+18.2%
Circumference93.02"99.08"+6.06"+6.5%
Revolutions per mile681.1639.5−41.7−6.1%

Speedometer difference

If your vehicle came with 245/55R19 and you fit 245/65R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.3 mph+1.3 mph
30 mph32.0 mph+2.0 mph
40 mph42.6 mph+2.6 mph
50 mph53.3 mph+3.3 mph
60 mph63.9 mph+3.9 mph
65 mph69.2 mph+4.2 mph
70 mph74.6 mph+4.6 mph
75 mph79.9 mph+4.9 mph
80 mph85.2 mph+5.2 mph

Each size on its own

Questions

Which is bigger, 245/55R19 or 245/65R19?
245/65R19 is taller by 1.93 inches (31.54" vs 29.61"). 245/55R19 is the same width.
Can I replace 245/55R19 with 245/65R19?
It is not recommended without checking carefully. The diameter difference is +6.5%, 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 245/65R19 change my speedometer?
When your speedometer reads 60 mph with 245/65R19 fitted (calibrated for 245/55R19), your real speed is 63.9 mph. Your odometer will under-count miles by about 6.5%.
Will 245/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.96 inches of ground clearance at the axle.

Other comparisons