Tire Size Box

315/25R24 vs 315/35R24

315/35R24 compared with 315/25R24

+8.2% diameter, 0.0" width

315/35R24 is 32.68" tall vs 30.20". More than the 3% rule of thumb, so check carefully before switching.

30.2"24" rim3.1"12.4" wide
315/25R24 (solid) compared with 315/35R24 (dashed outline), drawn to scale

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

64.9 mph

315/35R24 is +2.48 inches (+8.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/25R24315/35R24Difference%
Overall diameter30.20"32.68"+2.48"+8.2%
Section width12.40"12.40"0.00"0.0%
Sidewall height3.10"4.34"+1.24"+40.0%
Circumference94.88"102.67"+7.79"+8.2%
Revolutions per mile667.8617.1−50.7−7.6%

Speedometer difference

If your vehicle came with 315/25R24 and you fit 315/35R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.6 mph+1.6 mph
30 mph32.5 mph+2.5 mph
40 mph43.3 mph+3.3 mph
50 mph54.1 mph+4.1 mph
60 mph64.9 mph+4.9 mph
65 mph70.3 mph+5.3 mph
70 mph75.7 mph+5.7 mph
75 mph81.2 mph+6.2 mph
80 mph86.6 mph+6.6 mph

Each size on its own

Questions

Which is bigger, 315/25R24 or 315/35R24?
315/35R24 is taller by 2.48 inches (32.68" vs 30.20"). 315/25R24 is the same width.
Can I replace 315/25R24 with 315/35R24?
It is not recommended without checking carefully. The diameter difference is +8.2%, 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 315/25R24), your real speed is 64.9 mph. Your odometer will under-count miles by about 8.2%.
Will 315/35R24 lift my vehicle?
Ride height changes by half the diameter difference: +1.24 inches of ground clearance at the axle.

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