Tire Size 315/70r18 in Inches

If you’re looking for a new set of tires for your vehicle, you may have come across the size 315 70r18. But what does that mean? And is it the right size for your car? We will discuss everything you need to know about tire size 315 70r18 in inches. We’ll cover what the size means, how it compares to another size, and whether or not it’s the right fit for your vehicle.

315/70r18 in Inches

The breakdown of tire features and metrics is elucidated in the comprehensive table below, offering valuable insights for better comprehension.

Overall Diameter (Tire Height)899 mm35.4″
Tread Width315 mm12.4″
Rim Diameter457.2 mm18″
Sidewall Height221 mm8.7″
Circumference2822.9 mm111.2″
Revolutions354 per km570 per mile

Dimension Breakdown
The breakdown of the tire size 315/70R18 is as follows:

  • 315: The first number, 315, represents the width of the tire in millimeters. In this case, the tire has a width of 315 mm, which is approximately 12.4 inches. This measurement refers to the distance between the outer edges of the tire’s tread.
  • 70: The second number, 70, indicates the aspect ratio or profile of the tire. It is the ratio of the tire’s sidewall height to its width. In this case, the sidewall height is 70% of the tire’s width.
  • R: The letter “R” denotes the tire’s construction type, which stands for radial. Radial construction is the most common type of tire construction, where the tire’s plies run radially across the tire from bead to bead, providing improved performance and durability.
  • 18: The final number, 18, represents the diameter of the wheel rim in inches that the tire is designed to fit. In this case, the tire is compatible with an 18-inch wheel diameter.

So, tire size 315/70R18 indicates a tire with a width of 315 mm, a sidewall height that is 70% of the width, radial construction, and is designed to fit an 18-inch wheel rim diameter.

Overall Diameter
The overall diameter of a 315 70r18 tire is 35.4 inches or 899 mm. This is slightly larger than a typical passenger car tire. The extra inch or so of diameter means that the 315 70r18 tires will be taller than a passenger car tire.

Section Width
The section width of a 315 70r18 tire is 12.4 inches or 315 mm. The section width is the width of the tire from sidewall to sidewall. The wider a tire is, the more contact it will have with the ground. The wider width means that the 315 70r18 tires will have a bigger contact patch with the ground.

The circumference of a 315 70r18 tire is 111.2 inches or 2822.9 mm. The circumference is the distance around the outside of the tire. The larger the circumference, the longer it will take for the tire to make one complete revolution.

Revolutions Per Mile
The revolutions per mile (rpm) of a 315 70r18 tire is 570. This means that the tire will make 570 complete revolutions in one mile. The higher the rpm, the more torque the tire can handle.

Sidewall Height
Sidewall height of a 315 70r18 tire is 8.7 inches or 221 mm. The sidewall height is the distance from the edge of the wheel to the top of the tread. The taller the sidewall, the more suspension travel you will have.

Wheel Size
The wheel size of a 315 70r18 tire is 18 inches or 457.20 mm. The wheel size is the diameter of the wheel that the tire is mounted on. The larger the wheel size, the easier it is to roll over obstacles.

Construction Type
The construction type of a 315 70r18 tire is radial. Radial tires are the most common type of tire. They have crisscrossing steel belts that run from the bead to the tread. Radial tires are known for their durability and long tread life.

In short, We can say that 315 70r18 is a bit larger than a passenger car tire. The overall diameter is 35.40 inches, and the section width is 12.40 inches. The sidewall height is slightly taller at 221 mm. The circumference is 111.20 inches or 2822.90 mm.

The revolutions per mile (rpm) is 570. And finally, the wheel size is 18 inches or 457.20 mm. The construction type is radial. If you’re looking for a durable tire with an extended tread life, the 315 70r18 is an excellent option. I hope these details help. If you still have any confusion, please let me know in the comments below. I’ll be happy to help! Thanks for reading!

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