Tire Size Box

265/30R19 vs 255/35R19

255/35R19 compared with 265/30R19

+3.0% diameter, −0.4" width

255/35R19 is 26.03" tall vs 25.26". More than the 3% rule of thumb, so check carefully before switching.

25.3"19" rim3.1"10.4" wide
265/30R19 (solid) compared with 255/35R19 (dashed outline), drawn to scale

With 255/35R19 tires, when your speedometer says 60 mph you are really going

61.8 mph

255/35R19 is +0.77 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/30R19255/35R19Difference%
Overall diameter25.26"26.03"+0.77"+3.0%
Section width10.43"10.04"−0.39"−3.8%
Sidewall height3.13"3.51"+0.38"+12.3%
Circumference79.36"81.77"+2.41"+3.0%
Revolutions per mile798.4774.9−23.6−2.9%

Speedometer difference

If your vehicle came with 265/30R19 and you fit 255/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.8 mph+1.8 mph
65 mph67.0 mph+2.0 mph
70 mph72.1 mph+2.1 mph
75 mph77.3 mph+2.3 mph
80 mph82.4 mph+2.4 mph

Each size on its own

Questions

Which is bigger, 265/30R19 or 255/35R19?
255/35R19 is taller by 0.77 inches (26.03" vs 25.26"). 265/30R19 is wider by 0.39 inches.
Can I replace 265/30R19 with 255/35R19?
It is not recommended without checking carefully. The diameter difference is +3.0%, 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 255/35R19 change my speedometer?
When your speedometer reads 60 mph with 255/35R19 fitted (calibrated for 265/30R19), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 255/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.38 inches of ground clearance at the axle.

Other comparisons