Tire Size Box

285/35R19 vs 285/45R19

285/45R19 compared with 285/35R19

+8.4% diameter, 0.0" width

285/45R19 is 29.10" tall vs 26.85". More than the 3% rule of thumb, so check carefully before switching.

26.9"19" rim3.9"11.2" wide
285/35R19 (solid) compared with 285/45R19 (dashed outline), drawn to scale

With 285/45R19 tires, when your speedometer says 60 mph you are really going

65.0 mph

285/45R19 is +2.24 inches (+8.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

285/35R19285/45R19Difference%
Overall diameter26.85"29.10"+2.24"+8.4%
Section width11.22"11.22"0.00"0.0%
Sidewall height3.93"5.05"+1.12"+28.6%
Circumference84.37"91.42"+7.05"+8.4%
Revolutions per mile751.0693.1−57.9−7.7%

Speedometer difference

If your vehicle came with 285/35R19 and you fit 285/45R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.7 mph+1.7 mph
30 mph32.5 mph+2.5 mph
40 mph43.3 mph+3.3 mph
50 mph54.2 mph+4.2 mph
60 mph65.0 mph+5.0 mph
65 mph70.4 mph+5.4 mph
70 mph75.8 mph+5.8 mph
75 mph81.3 mph+6.3 mph
80 mph86.7 mph+6.7 mph

Each size on its own

Questions

Which is bigger, 285/35R19 or 285/45R19?
285/45R19 is taller by 2.24 inches (29.10" vs 26.85"). 285/35R19 is the same width.
Can I replace 285/35R19 with 285/45R19?
It is not recommended without checking carefully. The diameter difference is +8.4%, 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 285/45R19 change my speedometer?
When your speedometer reads 60 mph with 285/45R19 fitted (calibrated for 285/35R19), your real speed is 65.0 mph. Your odometer will under-count miles by about 8.4%.
Will 285/45R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.12 inches of ground clearance at the axle.

Other comparisons