Tire Size Box

225/35R19 vs 225/45R19

225/45R19 compared with 225/35R19

+7.0% diameter, 0.0" width

225/45R19 is 26.97" tall vs 25.20". More than the 3% rule of thumb, so check carefully before switching.

25.2"19" rim3.1"8.9" wide
225/35R19 (solid) compared with 225/45R19 (dashed outline), drawn to scale

With 225/45R19 tires, when your speedometer says 60 mph you are really going

64.2 mph

225/45R19 is +1.77 inches (+7.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/35R19225/45R19Difference%
Overall diameter25.20"26.97"+1.77"+7.0%
Section width8.86"8.86"0.00"0.0%
Sidewall height3.10"3.99"+0.89"+28.6%
Circumference79.17"84.74"+5.57"+7.0%
Revolutions per mile800.3747.7−52.6−6.6%

Speedometer difference

If your vehicle came with 225/35R19 and you fit 225/45R19, 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 mph42.8 mph+2.8 mph
50 mph53.5 mph+3.5 mph
60 mph64.2 mph+4.2 mph
65 mph69.6 mph+4.6 mph
70 mph74.9 mph+4.9 mph
75 mph80.3 mph+5.3 mph
80 mph85.6 mph+5.6 mph

Each size on its own

Questions

Which is bigger, 225/35R19 or 225/45R19?
225/45R19 is taller by 1.77 inches (26.97" vs 25.20"). 225/35R19 is the same width.
Can I replace 225/35R19 with 225/45R19?
It is not recommended without checking carefully. The diameter difference is +7.0%, 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 225/45R19 change my speedometer?
When your speedometer reads 60 mph with 225/45R19 fitted (calibrated for 225/35R19), your real speed is 64.2 mph. Your odometer will under-count miles by about 7.0%.
Will 225/45R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.89 inches of ground clearance at the axle.

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