285 vs 315 Tires

285 vs 315 Tires

The difference between 285 and 315 tires is the width in millimeters. The 315 tire size is 30 millimeters wider than the 285 tire size. The 285 tire has a width of 285 millimeters, while the 315 tire has a width of 315 millimeters.

The choice between these two tire sizes depends on a few factors, such as the vehicle’s specifications, driving conditions, and personal preferences. Generally, wider tires provide better traction and handling, especially in dry conditions.

285 vs 315 Table

Let’s take a closer look at two tire sizes with the same aspect ratio and rim size to understand their key differences. In this analysis, we’ll be comparing the 315/75r16 and 285/75r16 tire sizes.

Feature 285/75R16 315/75R16 Difference
Diameter 32.83″ 34.6″ 1.77 inch
Width 11.22″ 12.4″ 1.18 inch
Circum. 103.14″ 108.71″ 5.57 inch
Sidewall Height 8.42″ 9.3″ 0.89 inch
Revolutions 614.31 582.85 31.45

Fuel Economy
The fuel economy of a vehicle is an important factor to consider when selecting the right tires. The wider the tire, the more rolling resistance it produces which reduces fuel efficiency. Therefore, one may assume that 315 tires would provide lower fuel efficiency than 285 tires.

However, this isn’t necessarily the case. Recent studies have revealed that the difference in fuel economy between 285 and 315 tires is minimal – often less than one mile per gallon on average.

Ground Clearance
The effect of tire size on ground clearance can depend on several factors, such as the type of vehicle, suspension system, and tire brand. In general, increasing tire size can reduce ground clearance, especially if the tire’s aspect ratio (the height of the sidewall as a percentage of the tire’s width) is smaller.

The 315 tire size has a wider width and a lower aspect ratio than a 285 tire size, which means it can potentially reduce ground clearance more than a 285 tire size. However, other factors, such as the tire tread type and the vehicle’s suspension system, can also affect ground clearance. Some tire brands may have taller sidewalls or deeper treads, which can offset the reduction in ground clearance caused by the wider tire size.

Handling & Acceleration
The larger tire sizes, such as 315, will have a wider contact patch with the road, potentially improving traction and handling, especially during cornering. However, this wider contact patch can also increase rolling resistance, negatively affecting acceleration and fuel efficiency.

Additionally, a larger tire size can increase the unsprung weight of the vehicle, which can negatively affect handling and ride quality, especially if the suspension system is not properly adjusted to compensate for the larger tire size.

The 285 tire size will have a narrower contact patch than the 315 tire size, which can reduce traction and handling, decrease rolling resistance, and improve acceleration and fuel efficiency.

How Much Wider Is A 315 Tire Than A 285?

The 315 tire is 30 millimeters wider than the 285 tire. Specifically, a 285 tire has a width of 285 millimeters, while a 315 tire has a width of 315 millimeters. This means that the 315 tire is approximately 10.5% wider than the 285 tire.

How Much Taller Is A 315 Tire Than A 285?

The overall height of a tire depends on various factors, such as the aspect ratio, wheel diameter, and the specific tire model. However, assuming both tires have the same aspect ratio and wheel diameter, a 315 tire is generally taller than a 285 tire.

For example, let’s consider the tire size of 315/75r16 and 285/75r16. Assuming the same aspect ratio of 75 and wheel diameter of 16 inches, the overall height of the 315 tires can be calculated as follows:

(75% of 315 mm x 2) + 16 inches = 34.6 inches

Similarly, the overall height of the 285 tires can be calculated as follows:

(75% of 285 mm x 2) + 16 inches = 32.83 inches

Therefore, the 315 tires would be approximately 1.77 inch or 45 millimeter taller than the 285 tires, assuming the same aspect ratio and wheel diameter. However, it’s important to note that the actual difference in overall height can vary depending on the specific tire model and other factors, so it’s always best to consult the manufacturer’s specifications for accurate measurements.

Can I Replace 285 Tires With 315?

Based on the rim width range, you can Replace 285 Tires With 315. But it would be best to keep a few things in mind before you make this change. Such as the specifications of your vehicle, the clearance in your wheel well, and the compatibility of the 315 tires with your existing wheel size.

First, it’s important to check your vehicle’s owner’s manual or consult a trusted mechanic to determine the maximum tire size that your vehicle can safely accommodate. If your vehicle is compatible with a tire size of 315, you’ll also need to ensure enough clearance in your wheel to accommodate the wider tire.

Additionally, you’ll need to ensure the 315 tire is compatible with your existing wheel size. The 315 tire typically requires a wider wheel than a 285 tire, so you’ll need to ensure your current wheels are wide enough to mount the 315 tires safely.

The 285 tires can usually be mounted on a wheel with a width ranging from 8.5 to 10.5 inches, and a 315 tire is recommended to be used with a rim width ranging from 9.5 to 11.5 inches. Since both tire sizes have an overlapping recommended rim width range, it suggests that they are potentially interchangeable.

Overall, when it comes to choosing between 285 and 315 tires, there is no clear winner. For those who are looking for better wet surfaces performance, the wider 315 tires offer more grip and make them a better choice.

However, people who prioritize fuel economy may prefer the 285 because they have less rolling resistance. Additionally, drivers who often drive on snowy roads may benefit from the extra traction of the 315 tires.

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