Tire Size Box

315/25R19 vs 315/35R19

315/35R19 compared with 315/25R19

+9.8% diameter, 0.0" width

315/35R19 is 27.68" 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 315/35R19 (dashed outline), drawn to scale

With 315/35R19 tires, when your speedometer says 60 mph you are really going

65.9 mph

315/35R19 is +2.48 inches (+9.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/25R19315/35R19Difference%
Overall diameter25.20"27.68"+2.48"+9.8%
Section width12.40"12.40"0.00"0.0%
Sidewall height3.10"4.34"+1.24"+40.0%
Circumference79.17"86.96"+7.79"+9.8%
Revolutions per mile800.3728.6−71.7−9.0%

Speedometer difference

If your vehicle came with 315/25R19 and you fit 315/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph22.0 mph+2.0 mph
30 mph33.0 mph+3.0 mph
40 mph43.9 mph+3.9 mph
50 mph54.9 mph+4.9 mph
60 mph65.9 mph+5.9 mph
65 mph71.4 mph+6.4 mph
70 mph76.9 mph+6.9 mph
75 mph82.4 mph+7.4 mph
80 mph87.9 mph+7.9 mph

Each size on its own

Questions

Which is bigger, 315/25R19 or 315/35R19?
315/35R19 is taller by 2.48 inches (27.68" vs 25.20"). 315/25R19 is the same width.
Can I replace 315/25R19 with 315/35R19?
It is not recommended without checking carefully. The diameter difference is +9.8%, 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 315/35R19 change my speedometer?
When your speedometer reads 60 mph with 315/35R19 fitted (calibrated for 315/25R19), your real speed is 65.9 mph. Your odometer will under-count miles by about 9.8%.
Will 315/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.24 inches of ground clearance at the axle.

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