Tire Size Box

265/35R19 vs 265/45R19

265/45R19 compared with 265/35R19

+7.9% diameter, 0.0" width

265/45R19 is 28.39" tall vs 26.30". More than the 3% rule of thumb, so check carefully before switching.

26.3"19" rim3.7"10.4" wide
265/35R19 (solid) compared with 265/45R19 (dashed outline), drawn to scale

With 265/45R19 tires, when your speedometer says 60 mph you are really going

64.8 mph

265/45R19 is +2.09 inches (+7.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/35R19265/45R19Difference%
Overall diameter26.30"28.39"+2.09"+7.9%
Section width10.43"10.43"0.00"0.0%
Sidewall height3.65"4.69"+1.04"+28.6%
Circumference82.63"89.19"+6.56"+7.9%
Revolutions per mile766.8710.4−56.4−7.3%

Speedometer difference

If your vehicle came with 265/35R19 and you fit 265/45R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.6 mph+1.6 mph
30 mph32.4 mph+2.4 mph
40 mph43.2 mph+3.2 mph
50 mph54.0 mph+4.0 mph
60 mph64.8 mph+4.8 mph
65 mph70.2 mph+5.2 mph
70 mph75.6 mph+5.6 mph
75 mph80.9 mph+5.9 mph
80 mph86.3 mph+6.3 mph

Each size on its own

Questions

Which is bigger, 265/35R19 or 265/45R19?
265/45R19 is taller by 2.09 inches (28.39" vs 26.30"). 265/35R19 is the same width.
Can I replace 265/35R19 with 265/45R19?
It is not recommended without checking carefully. The diameter difference is +7.9%, 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 265/45R19 change my speedometer?
When your speedometer reads 60 mph with 265/45R19 fitted (calibrated for 265/35R19), your real speed is 64.8 mph. Your odometer will under-count miles by about 7.9%.
Will 265/45R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.04 inches of ground clearance at the axle.

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