Tire Size Box

265/55R19 vs 265/65R19

265/65R19 compared with 265/55R19

+6.8% diameter, 0.0" width

265/65R19 is 32.56" tall vs 30.48". More than the 3% rule of thumb, so check carefully before switching.

30.5"19" rim5.7"10.4" wide
265/55R19 (solid) compared with 265/65R19 (dashed outline), drawn to scale

With 265/65R19 tires, when your speedometer says 60 mph you are really going

64.1 mph

265/65R19 is +2.09 inches (+6.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/55R19265/65R19Difference%
Overall diameter30.48"32.56"+2.09"+6.8%
Section width10.43"10.43"0.00"0.0%
Sidewall height5.74"6.78"+1.04"+18.2%
Circumference95.74"102.30"+6.56"+6.8%
Revolutions per mile661.8619.4−42.4−6.4%

Speedometer difference

If your vehicle came with 265/55R19 and you fit 265/65R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.1 mph+2.1 mph
40 mph42.7 mph+2.7 mph
50 mph53.4 mph+3.4 mph
60 mph64.1 mph+4.1 mph
65 mph69.5 mph+4.5 mph
70 mph74.8 mph+4.8 mph
75 mph80.1 mph+5.1 mph
80 mph85.5 mph+5.5 mph

Each size on its own

Questions

Which is bigger, 265/55R19 or 265/65R19?
265/65R19 is taller by 2.09 inches (32.56" vs 30.48"). 265/55R19 is the same width.
Can I replace 265/55R19 with 265/65R19?
It is not recommended without checking carefully. The diameter difference is +6.8%, 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 265/65R19 change my speedometer?
When your speedometer reads 60 mph with 265/65R19 fitted (calibrated for 265/55R19), your real speed is 64.1 mph. Your odometer will under-count miles by about 6.8%.
Will 265/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.04 inches of ground clearance at the axle.

Other comparisons