315/20R30 in inches

How tall is a 315 20R30 tire?

When converted to inches, the equivalent of a 315/20R30 tire size is 35x12.4R30. It means that:

  • height overall (or diameter) is 35 inches
  • tread width is 12.4 inches
  • wheel diameter is 30 inches

Learn more

315/20R30 tire size in inches
315/20R30 tire size chart

315/20R30 tire size in inches

315/20R30 Height / overall diameter: 35 inches
Height / overall diameter
35 inches
315/20R30 Tread width: 12.4 inches
Tread width
12.4 inches
315/20R30 Sidewall: 2.5 inches
2.5 inches
315/20R30 Wheel diameter: 30 inches
Wheel diameter
30 inches
315/20R30 Circumference: 109.9 inches
109.9 inches
315/20R30 Revolutions: 576 per mile
576 per mile

315/20R30 — what does it mean?

  • 315 stands for tread width in millimeters
  • 20 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 30 is a wheel diameter (or rim) in inches

315/20R30 tire code
315/20R30 tire code

How to convert 315 20R30 to inches?

First of all, we need to divide 315 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 12.4″. Then, 20% of the 12.4″ will result in 2.5″ sidewall.

To get the total height or tire diameter, we need to sum the 30″ rim diameter with two of the sidewall heights. It will result in a 35″ total tire diameter (or height).

For your convenience, below is a table for 315/20R30 conversion to inches:

Inches Metric
Overall diameter (height) 35″ 889 mm
Tread width 12.4″ 315 mm
Wheel diameter 30″ 889 mm
Sidewall height 2.5″ 63 mm
Circumference 109.9″ 2791 mm
Revolutions 576 / ml 358 / km

Alternatives to a 315/20R30 tire

If you're looking to upsize your 315 20R30 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
255/30R30 36″ 0.69% 10″ 30″
275/25R30 35.4″ 0.28% 10.8″ 30″