How Wide Is A 315 Tire? (Width In MM and Inches)

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Considering the tire’s width is crucial because it directly impacts your vehicle’s performance. Wider tires, such as 315, are considered excellent for large and commercial vehicles. But you may have a question: How wide is a 315 tire?

A 315 tire has a width of 315 mm, or 12.4 inches. The width of 315 tires can vary depending on the shape of different brands. It is a wider tire that might increase traction, control, and stability on unpaved surfaces. However, its increased friction may also decrease fuel economy or increase noise.

Let’s explore more about 315 tires. After reading the information below, you can decide to use a 315 tire on your vehicle.

Is a 315 Tire Considered Wide? – Its Width in mm and Inches

Yes, a 315 tire is considered a wide tire and is recommended by experts when you need wider tires. Its 315 mm width offers enough support to carry a heavy load. 

It has enough strength to ensure stability, traction, and consistent performance on rough terrain. 

However, they may impact fuel efficiency and control in certain conditions.

a) 315 Tire in mm

How wide is a 315 tire in mm? A 315 tire is named for its tread width in millimeters. It is named for its actual width in mm. So, a 315 tire has a width of 315mm. You may see a variation of one or two mm if choosing between different brands. Otherwise, every 315 tire has a 315mm width.

b) 315 Tire Width in Inches

How wide is a 315 tire in inches? Some people prefer measurement in width because it is easier than in mm. A 315 tire is 12.4” wider in sections.

315 Tire Size Vs. 35” – Are They Same?

Yes, 315 tire sizes and 35 tire sizes are the same. 315 is the measurement of the tire in mm and is used for expressing the tire width. It tells about the tread section width of the tire. While the 35” is used to represent the tire’s diameter. 

Do all 315 Tires Have the Same Width?

No, not all 315 tires have the same width. It’s a number that represents the tire section width in mm. It is the width from sidewall to sidewall.

However, you may find differences in width when comparing different brands of 315 tires. The width can vary by a few mm depending on the tire shape.

So, it is better to check the tire specification before purchasing and ensure you choose the right one.

What Types of Vehicles Use 315 Tires?

The 315 tire is wider and recommended for heavy-weight vehicles such as SUVs, trucks, and commercial vehicles. These tires offer excellent load-bearing capacity and traction, which makes them perfect for certain challenging applications.

You may find them on trucks used for construction, hauling, or off-road purposes. 315 tires are very durable, which makes them suitable for many popular brands.

Here is a list of a few popular brands that use 315 tires.

  • BMW 

Can I Put 315 Tire on Any Vehicle?

No, you cannot use the 315 tires on any vehicle without consulting its specifications. The selection of a tire width for any vehicle depends on factors such as the vehicle’s wall clearance, rim width, and suspension setup. 

Always ensure that the tire does not rub when moving. So, always consult the vehicle’s manual or an expert to choose the suitable option.

How Does a Wider Tire Affect Performance? Benefits and Drawbacks

When it comes to installing wider tires, such as 315 tires, on your vehicle, the first question that comes to mind is how a wider tire affects performance. The wider tires have certain benefits and drawbacks that may enhance or limit performance. 

Benefits of wider tires

1. Improved Grip and Traction

The wider tires have a larger contact area with the road, which may increase traction and grip. It will increase the friction level between the road and the tire; ultimately, you will experience better traction on dry or wet terrain. 

Due to enhanced friction, the braking distances were also reduced. Wider tires also improve cornering abilities by reducing slip during acceleration. 

Due to such improved factors, driving safety and performance may be boosted by installing wider tires.

2. Improve Handling and Aesthetics

The wider tires ensure improved handling, allowing smoother maneuvering through the corners and increasing stability. You can enjoy a more engaging driving experience than before.

On the other hand, from an aesthetic standpoint, the wider tires look more aggressive and appealing than standard tires. They look awesome on sporty vehicles.

Drawbacks of wider tires

1. Reduce The Fuel Economy

As discussed earlier, wider tires create more friction than thinner tires, which may increase the load on the engine. Due to increased engine load, fuel efficiency may decrease.

Another factor that may decrease fuel efficiency and speed is the heavier weight. Wider tires are heavy. They also need larger rims that require more force for movement and may negatively impact the fuel economy.

2. Reduces Ride Comfort

Everyone enjoys smooth, quiet rides. The wider tires have lower sidewalls that may compromise ride comfort. They produce more noise and are more sensitive to road imperfections. 

The wider tires have wider patches that may generate more noise at higher speeds than the thinner ones. So, your ride can be less comfortable after installing the wider tires.

Do I Need Adjustment In My Vehicle If I Switch To 315 Tire?

Yes, if you are switching to 315 tires, you must adjust your vehicle to make it suitable. The 315 tire size may differ from the factory tire, so if you use it without any adjustment, it may have an alignment issue. 

When you switch to 315 tires, you must adjust the vehicle’s alignment. Otherwise, you may experience stretchiness in the suspension and a change in caster and toe angles.


Will a 315 fit on a 12-inch rim?

Yes, a 315 tire can easily fit on a 12-inch rim. You mount a 315 tire on an 11.5 to 12-inch rim for a perfect fit. No worries; it will not affect the performance.

How much larger is a 315 tire than a 305?

The 315 tire is slightly larger than the 305 tire. It is only 10mm wider than 305 tires if compared to millimeters. However, their diameter also varies. A 315 tire has a diameter of 34.6 inches, while the diameter of a 305 tire is 32 inches.

Can you fit a 315 on a 9.5 rim?

No, it is not the approved width for a 315 tire. For a 315 tire, the recommended rim width should be between 10.5 and 12.5. You must pay attention to the recommendations to avoid poor performance. 

Can I put 285 tires on 315 rims?

Yes, there is no issue with putting 285 tires on a 315 rim. The width is within the recommended range, ensuring a good performance.


A 315 tire has a width of 315 mm or 12.4 inches. It is a wider tire that ensures consistent performance for heavy loads.

You can drive on rough terrain worry-free. The 315 tires can be fitted on a 10.5 to 12.5-inch rim without any modification.

However, it is good to adjust the alignment for smooth performance. But remember that the 315 tires may increase noise and reduce fuel economy.

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