305 70r18 vs 35×12 50r18 Tire Size

When it comes to off-road driving, one of the most important aspects is the tire’s ability to handle slippery surfaces. After all, no matter how good your handling and acceleration are on an uneven terrain, if your tires can’t take you places safely then what’s the point?

Fortunately, we have plenty of information about the pros and cons of two very popular sizes of tires: The 305 70r18 and 35×12 50r18 tire size. Both have their own advantages in different areas – but which one is right for you? Keep reading to find out more!

305 70r18 vs 35×12 50r18 Table

What Does 305 70r18 Tire Mean?

The first number in tire size, such as 305, tells you the width of the tire in millimeters. The second number, 70, tells you the aspect ratio. The aspect ratio is the height of the tire’s sidewall expressed as a percentage of the width.

In this case, 70 means that the sidewall is 70% as tall as the width of the tire. The last number, 18, is the rim diameter in inches. The “r” stands for radial, which is the type of tire.

Tire Diameter

One important thing to note about tire diameter is that it can affect the speed rating of your tires. The diameter of the 35×12 50r18 tires is about 35 inches, which is too large for most speed ratings.

If you want to keep the same speed rating as to your previous tires, you’ll have to choose a different size. The 305 70r18 tires have a diameter of about 34.81 inches, which is a bit smaller. The difference in the diameter is 0.22 inches or 0.6%.

Section Width

The section width of a tire is the width from one sidewall to the other. The section width of the 305 70r18 tires is 12.01 inches, and the section width of the 35×12 50r18 tires is 12.52 inches. The difference in width is 0.51 inches or 4.3%.

Circumference

The circumference of a tire is the distance around the outside of the tire. The circumference of the 305 70r18 tires is 109.36 inches, and the circumference of the 35×12 50r18 tires is 110.04 inches.

The difference in circumference is 0.68 inches or about 0.6%. This means that the 35×12 50r18 tires are slightly wider and have a larger circumference than the 305 70r18 tires.

Revolutions Per Mile

The number of revolutions in one mile is referred to as the tire’s RPM. The RPM for the 305 70r18 tires is about 579, and the RPM for the 35×12 50r18 tires is about 575. This means that the 305 70r18 tires will travel slightly further in one mile than the 35×12 50r18 tires. The difference in RPM is around 4 or 0.6%.

Sidewall Height

The sidewall height of a tire is the distance from the edge of the rim to the top of the tread. The sidewall height of the 305 70r18 tires is about 8.41 inches, and the sidewall height of the 35×12 50r18 tires is about 8.51 inches. The difference in sidewall height is 0.11 inches or around 1.3%.

Wheel Size

Rim size does not affect the tire’s overall diameter, but it does affect the width of the tire. The wheel size of the 305 70r18 tire size is 18 inches, and the wheel size of the 35×12 50r18 tire size is 18 inches. So, there is no difference in wheel size between these two tires.

Construction Type

Tire Construction type is the way in which the tire’s plies are arranged. The 305 70r18 tires are radial tires, and the 35×12 50r18 tires are also radial tires. So, there is no difference in construction type between these two tire sizes.

Our Observation

The main difference between 305 70r18 and 35×12 50r18 tire Sizes is in the tire width. The 35×12 50r18 tires are about 0.51 inches or 12.52 mm, more comprehensive than the 305 70r18 tires. The difference in width is about 0.51 inches or 12.52 mm. Other than that, the two tire sizes are very similar in different aspects.

Conclusion

We hope this guide helped you understand the difference between these two tire sizes and helped you decide which one is right for your vehicle. If you have any other questions, feel free to contact us or leave a comment below. Thanks for reading!

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