Tire Size Box

245/30R19 vs 245/35R19

245/35R19 compared with 245/30R19

+3.9% diameter, 0.0" width

245/35R19 is 25.75" tall vs 24.79". More than the 3% rule of thumb, so check carefully before switching.

24.8"19" rim2.9"9.6" wide
245/30R19 (solid) compared with 245/35R19 (dashed outline), drawn to scale

With 245/35R19 tires, when your speedometer says 60 mph you are really going

62.3 mph

245/35R19 is +0.96 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/30R19245/35R19Difference%
Overall diameter24.79"25.75"+0.96"+3.9%
Section width9.65"9.65"0.00"0.0%
Sidewall height2.89"3.38"+0.48"+16.7%
Circumference77.87"80.90"+3.03"+3.9%
Revolutions per mile813.6783.2−30.5−3.7%

Speedometer difference

If your vehicle came with 245/30R19 and you fit 245/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 245/30R19 or 245/35R19?
245/35R19 is taller by 0.96 inches (25.75" vs 24.79"). 245/30R19 is the same width.
Can I replace 245/30R19 with 245/35R19?
It is not recommended without checking carefully. The diameter difference is +3.9%, 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 245/35R19 change my speedometer?
When your speedometer reads 60 mph with 245/35R19 fitted (calibrated for 245/30R19), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.9%.
Will 245/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.48 inches of ground clearance at the axle.

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