Tire Size Box

255/60R19 vs 275/60R19

275/60R19 compared with 255/60R19

+3.0% diameter, +0.8" width

275/60R19 is 31.99" tall vs 31.05". More than the 3% rule of thumb, so check carefully before switching.

31.0"19" rim6.0"10.0" wide
255/60R19 (solid) compared with 275/60R19 (dashed outline), drawn to scale

With 275/60R19 tires, when your speedometer says 60 mph you are really going

61.8 mph

275/60R19 is +0.94 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

255/60R19275/60R19Difference%
Overall diameter31.05"31.99"+0.94"+3.0%
Section width10.04"10.83"+0.79"+7.8%
Sidewall height6.02"6.50"+0.47"+7.8%
Circumference97.54"100.51"+2.97"+3.0%
Revolutions per mile649.6630.4−19.2−3.0%

Speedometer difference

If your vehicle came with 255/60R19 and you fit 275/60R19, 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, 255/60R19 or 275/60R19?
275/60R19 is taller by 0.94 inches (31.99" vs 31.05"). 275/60R19 is wider by 0.79 inches.
Can I replace 255/60R19 with 275/60R19?
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 275/60R19 change my speedometer?
When your speedometer reads 60 mph with 275/60R19 fitted (calibrated for 255/60R19), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 275/60R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.47 inches of ground clearance at the axle.

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