Tire Size Box

305/55R19 vs 305/60R19

305/60R19 compared with 305/55R19

+3.7% diameter, 0.0" width

305/60R19 is 33.41" tall vs 32.21". More than the 3% rule of thumb, so check carefully before switching.

32.2"19" rim6.6"12.0" wide
305/55R19 (solid) compared with 305/60R19 (dashed outline), drawn to scale

With 305/60R19 tires, when your speedometer says 60 mph you are really going

62.2 mph

305/60R19 is +1.20 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

305/55R19305/60R19Difference%
Overall diameter32.21"33.41"+1.20"+3.7%
Section width12.01"12.01"0.00"0.0%
Sidewall height6.60"7.20"+0.60"+9.1%
Circumference101.19"104.96"+3.77"+3.7%
Revolutions per mile626.2603.7−22.5−3.6%

Speedometer difference

If your vehicle came with 305/55R19 and you fit 305/60R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 305/55R19 or 305/60R19?
305/60R19 is taller by 1.20 inches (33.41" vs 32.21"). 305/55R19 is the same width.
Can I replace 305/55R19 with 305/60R19?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 305/60R19 change my speedometer?
When your speedometer reads 60 mph with 305/60R19 fitted (calibrated for 305/55R19), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 305/60R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.60 inches of ground clearance at the axle.

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