Tire Size Box

345/30R19 vs 345/35R19

345/35R19 compared with 345/30R19

+5.0% diameter, 0.0" width

345/35R19 is 28.51" tall vs 27.15". More than the 3% rule of thumb, so check carefully before switching.

27.1"19" rim4.1"13.6" wide
345/30R19 (solid) compared with 345/35R19 (dashed outline), drawn to scale

With 345/35R19 tires, when your speedometer says 60 mph you are really going

63.0 mph

345/35R19 is +1.36 inches (+5.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/30R19345/35R19Difference%
Overall diameter27.15"28.51"+1.36"+5.0%
Section width13.58"13.58"0.00"0.0%
Sidewall height4.07"4.75"+0.68"+16.7%
Circumference85.29"89.56"+4.27"+5.0%
Revolutions per mile742.9707.5−35.4−4.8%

Speedometer difference

If your vehicle came with 345/30R19 and you fit 345/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.0 mph+1.0 mph
30 mph31.5 mph+1.5 mph
40 mph42.0 mph+2.0 mph
50 mph52.5 mph+2.5 mph
60 mph63.0 mph+3.0 mph
65 mph68.3 mph+3.3 mph
70 mph73.5 mph+3.5 mph
75 mph78.8 mph+3.8 mph
80 mph84.0 mph+4.0 mph

Each size on its own

Questions

Which is bigger, 345/30R19 or 345/35R19?
345/35R19 is taller by 1.36 inches (28.51" vs 27.15"). 345/30R19 is the same width.
Can I replace 345/30R19 with 345/35R19?
It is not recommended without checking carefully. The diameter difference is +5.0%, 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 345/35R19 change my speedometer?
When your speedometer reads 60 mph with 345/35R19 fitted (calibrated for 345/30R19), your real speed is 63.0 mph. Your odometer will under-count miles by about 5.0%.
Will 345/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.68 inches of ground clearance at the axle.

Other comparisons