What Is 305 Tire Size? Exploring Measurements, Benefits & Suitability

The 305 tire size, with a width of approximately 12 inches, is commonly used in trucks, SUVs, and high-performance sports cars for better grip and stability. The sidewall height is represented as a percentage of the tire’s width, and the “R” stands for radial construction. The last number indicates the wheel diameter. However, larger tires like 305s may negatively impact fuel efficiency due to increased weight, altered rolling resistance, and aerodynamic changes.

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Written by: Mohammad Sameer

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Ever stared at a tire size like 305/70R18 and felt completely lost? Yeah, me too. Those numbers and letters can be confusing.

But listen up, because figuring out tire sizes isn’t rocket science.

Let us break this 305 code and see what it means for your car.

Key Takeaways

  • When considering tire size for your car, it’s important to understand the measurements in inches and how they impact your vehicle’s performance and handling.
  • Comparing 305 tires for your car with common alternatives, such as tires with different inches, can help you make an informed decision based on your specific driving needs and conditions.
  • The stability and traction benefits of 305 tires make them suitable for off-road, high-performance, and heavy-duty vehicles. These tires are especially effective for off-road car driving, with a width of 305 inches.
  • It’s crucial to assess the load capacity of 305 tires in inches to ensure they can support the weight requirements of your vehicle and any additional cargo.
  • 305 tire size is commonly used in trucks, SUVs, and some high-performance sports cars, catering to drivers with diverse needs and preferences.
  • While 305 tires offer excellent traction and stability, it’s important to consider their impact on gas mileage, especially for daily commuting or long-distance driving.

What is 305 tire size?

What is 305 tire size?
image source: stocktonwheel.com

You have got a 305 tire on your hands, huh? That means that sidewall is nice and wide, clocking in at 305 millimetres (about 12 inches). Wider tires are all about giving you more grip and keeping your car stable, especially when you are taking corners or dealing with bad weather.

The whole sizing thing can be confusing, but here’s the breakdown:

  • That first number (305) is the width we just talked about.
  • The second number (35) is a percentage that tells you how tall the sidewall is compared to the width. So, a higher number means a taller sidewall.
  • The “R” stands for radial construction, which is the most common type of tire these days.
  • The last number (17) tells you the diameter of the wheel the tire is built to fit. Make sure this matches your wheels or you won’t be able to put them on!

Where is 305 Tire Size Commonly Used?

Where is 305 Tire Size Commonly Used?
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For drivers who require exceptional performance from their trucks, SUVs, or towing vehicles, particularly in off-road conditions, 305 tires offer a compelling solution.

These tires feature a wider tread design, resulting in an increased contact patch with the ground. This translates to enhanced grip and improved stability, crucial for maintaining control on uneven terrain.

Understanding the Impact of 305 Tires on Gas Mileage

While larger tires, such as 305s, can enhance a vehicle’s aesthetics, it’s crucial to understand their potential impact on fuel efficiency. Here are some key factors to consider:

  • Increased Weight: Larger tires inherently weigh more. This additional weight can strain your engine, requiring it to work harder to maintain speed. Consequently, fuel consumption may increase.
  • Altered Rolling Resistance: Wider tires create a larger contact patch with the road surface. While this can improve handling, it also increases rolling resistance. This resistance necessitates greater engine power to overcome, potentially impacting fuel economy.
  • Aerodynamic Considerations: Taller tires can raise a vehicle’s center of gravity. This increased height may negatively impact aerodynamics by creating more wind resistance. As a result, fuel efficiency may suffer.

It’s important to consult your vehicle’s manual or a qualified mechanic to determine if 305 tires are compatible with your specific car. They can also advise on potential changes in fuel efficiency based on your vehicle’s characteristics.

Evaluating the Durability and Performance of 305 Tires

Looking for tough tires that can handle anything you throw at them? The NT05 in size 305/30R20 might be your perfect match. They boast a durability score of 7.2, meaning they will resist wear and tear for miles to come.

Need to tow heavy loads or haul a trailer? Wider tires like these 305s are your friend. The extra width provides better stability and traction, giving you more control and confidence on the road.

Want tires that last? Look no further. These bad boys come with a treadwear rating of 500, which translates to a roughly 45,000-mile warranty. This means you can expect excellent traction, a quiet ride, and long-lasting performance.

wider tires can affect handling. They might make cornering feel a bit different, and braking distances could be slightly increased. they’re built to perform well under pressure, making them ideal for vehicles that need strength and durability in their tires.

Pros and Cons of Using 305 Tires


  • Grip Like Glue: Get ready for better traction! These wider tires offer more grip on the road, keeping you in control during sharp turns and spirited driving.
  • Smooth Operator: The taller sidewall acts like a cushion, absorbing bumps and creating a smoother ride compared to lower-profile options.
  • Looking Good: Let’s face it, some folks just love the look of a wider tire. These 305/35-20s will enhance your car’s aesthetics.
  • Wheel Saver: The extra sidewall provides more protection for your wheels from those pesky curbs and potholes.
  • Performance Powerhouse: Wider tires often open doors to high-performance options like Toyo RA1s or Nittos, perfect for pushing your car’s limits.


  • Trade-off for Comfort: Be aware that the lower profile of these tires might translate to a slightly harsher ride compared to tires with a taller sidewall.
  • Fewer Choices: You might have a smaller pool of tires to choose from compared to more common sizes. This could limit your options depending on your needs.
  • Cost Factor: Wider tires often mean bigger costs. Consider potential needs for additional parts like wheel spacers or camber plates, which can add to the overall price tag.

Frequently Asked Questions

What are the key benefits of using 305 tires?

Benefits: Improved handling, stability, and traction.
Considerations: Potential decrease in fuel efficiency, fitment compatibility.

Where are 305 tire sizes commonly used?

They are popular for off-roading and performance cars thanks to the grippy, wide tread. Strong enough for hefty trucks and SUVs too. Considering customizing? These might be the ticket, but check with a pro for proper fit.

Will using 305 tires impact my vehicle’s gas mileage?

Look, slapping on 305 tires might mean you hit the pump more often. These wider tires are tougher for your car to push around, so your gas mileage will likely take a dip. It’s a trade-off to consider. You get the benefits of the 305s, but you might pay a bit more at the gas station.

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About Mohammad Sameer

My name is Mohammad Sameer and I have over 3 years of hands-on experience repairing cars, motorcycles, and trucks. Ever since I operated on my first engine in 2018, I’ve been passionate about all things automotive. In 2021, I launched my blog “Motoring Mastery” to share my knowledge with car enthusiasts and DIY mechanics.