Tire Size Box

295/65R19 vs 315/65R19

315/65R19 compared with 295/65R19

+3.0% diameter, +0.8" width

315/65R19 is 35.12" tall vs 34.10". More than the 3% rule of thumb, so check carefully before switching.

34.1"19" rim7.5"11.6" wide
295/65R19 (solid) compared with 315/65R19 (dashed outline), drawn to scale

With 315/65R19 tires, when your speedometer says 60 mph you are really going

61.8 mph

315/65R19 is +1.02 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/65R19315/65R19Difference%
Overall diameter34.10"35.12"+1.02"+3.0%
Section width11.61"12.40"+0.79"+6.8%
Sidewall height7.55"8.06"+0.51"+6.8%
Circumference107.12"110.34"+3.22"+3.0%
Revolutions per mile591.5574.2−17.2−2.9%

Speedometer difference

If your vehicle came with 295/65R19 and you fit 315/65R19, 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, 295/65R19 or 315/65R19?
315/65R19 is taller by 1.02 inches (35.12" vs 34.10"). 315/65R19 is wider by 0.79 inches.
Can I replace 295/65R19 with 315/65R19?
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 315/65R19 change my speedometer?
When your speedometer reads 60 mph with 315/65R19 fitted (calibrated for 295/65R19), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 315/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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