Tire Size Box

315/30R19 vs 315/35R19

315/35R19 compared with 315/30R19

+4.7% diameter, 0.0" width

315/35R19 is 27.68" tall vs 26.44". More than the 3% rule of thumb, so check carefully before switching.

26.4"19" rim3.7"12.4" wide
315/30R19 (solid) compared with 315/35R19 (dashed outline), drawn to scale

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

62.8 mph

315/35R19 is +1.24 inches (+4.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/30R19315/35R19Difference%
Overall diameter26.44"27.68"+1.24"+4.7%
Section width12.40"12.40"0.00"0.0%
Sidewall height3.72"4.34"+0.62"+16.7%
Circumference83.07"86.96"+3.90"+4.7%
Revolutions per mile762.8728.6−34.2−4.5%

Speedometer difference

If your vehicle came with 315/30R19 and you fit 315/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.9 mph+0.9 mph
30 mph31.4 mph+1.4 mph
40 mph41.9 mph+1.9 mph
50 mph52.3 mph+2.3 mph
60 mph62.8 mph+2.8 mph
65 mph68.0 mph+3.0 mph
70 mph73.3 mph+3.3 mph
75 mph78.5 mph+3.5 mph
80 mph83.8 mph+3.8 mph

Each size on its own

Questions

Which is bigger, 315/30R19 or 315/35R19?
315/35R19 is taller by 1.24 inches (27.68" vs 26.44"). 315/30R19 is the same width.
Can I replace 315/30R19 with 315/35R19?
It is not recommended without checking carefully. The diameter difference is +4.7%, 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 315/35R19 change my speedometer?
When your speedometer reads 60 mph with 315/35R19 fitted (calibrated for 315/30R19), your real speed is 62.8 mph. Your odometer will under-count miles by about 4.7%.
Will 315/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.62 inches of ground clearance at the axle.

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