Tire Size Box

315/30R24 vs 315/35R24

315/35R24 compared with 315/30R24

+3.9% diameter, 0.0" width

315/35R24 is 32.68" tall vs 31.44". More than the 3% rule of thumb, so check carefully before switching.

31.4"24" rim3.7"12.4" wide
315/30R24 (solid) compared with 315/35R24 (dashed outline), drawn to scale

With 315/35R24 tires, when your speedometer says 60 mph you are really going

62.4 mph

315/35R24 is +1.24 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/30R24315/35R24Difference%
Overall diameter31.44"32.68"+1.24"+3.9%
Section width12.40"12.40"0.00"0.0%
Sidewall height3.72"4.34"+0.62"+16.7%
Circumference98.77"102.67"+3.90"+3.9%
Revolutions per mile641.5617.1−24.3−3.8%

Speedometer difference

If your vehicle came with 315/30R24 and you fit 315/35R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.8 mph+2.8 mph
75 mph78.0 mph+3.0 mph
80 mph83.2 mph+3.2 mph

Each size on its own

Questions

Which is bigger, 315/30R24 or 315/35R24?
315/35R24 is taller by 1.24 inches (32.68" vs 31.44"). 315/30R24 is the same width.
Can I replace 315/30R24 with 315/35R24?
It is not recommended without checking carefully. The diameter difference is +3.9%, 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 315/35R24 change my speedometer?
When your speedometer reads 60 mph with 315/35R24 fitted (calibrated for 315/30R24), your real speed is 62.4 mph. Your odometer will under-count miles by about 3.9%.
Will 315/35R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.62 inches of ground clearance at the axle.

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