Tire Size Box

315/25R19 vs 295/30R19

295/30R19 compared with 315/25R19

+3.0% diameter, −0.8" width

295/30R19 is 25.97" tall vs 25.20". More than the 3% rule of thumb, so check carefully before switching.

25.2"19" rim3.1"12.4" wide
315/25R19 (solid) compared with 295/30R19 (dashed outline), drawn to scale

With 295/30R19 tires, when your speedometer says 60 mph you are really going

61.8 mph

295/30R19 is +0.77 inches (+3.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/25R19295/30R19Difference%
Overall diameter25.20"25.97"+0.77"+3.0%
Section width12.40"11.61"−0.79"−6.3%
Sidewall height3.10"3.48"+0.38"+12.4%
Circumference79.17"81.58"+2.41"+3.0%
Revolutions per mile800.3776.6−23.7−3.0%

Speedometer difference

If your vehicle came with 315/25R19 and you fit 295/30R19, 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, 315/25R19 or 295/30R19?
295/30R19 is taller by 0.77 inches (25.97" vs 25.20"). 315/25R19 is wider by 0.79 inches.
Can I replace 315/25R19 with 295/30R19?
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 295/30R19 change my speedometer?
When your speedometer reads 60 mph with 295/30R19 fitted (calibrated for 315/25R19), your real speed is 61.8 mph. Your odometer will under-count miles by about 3.0%.
Will 295/30R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.38 inches of ground clearance at the axle.

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