Difference Between 275 and 305 Tires – Know Which is Best for You!

install 305 tires on a 275 rim

Selecting the correct tire size for your car is crucial, and the specifics in the numbers can’t be overlooked. For instance, when comparing 275 tires to 305 tires, even though the distinction may appear minor, it greatly influences your car’s behavior on the road.

The wider 305 tires can offer enhanced traction and stability, especially during cornering, while the 275 tires might provide better fuel efficiency due to less rolling resistance. Today, I will walk you through the characteristics of both sizes and help you determine which suits your driving preferences and requirements best.

Goodyear Wrangler TrailRunner AT(P Street Radial Tire-275/60R20 115S
Mickey Thompson Baja MTZP3 Mud Terrain Radial Tire - LT305/55R20 121Q
Goodyear Wrangler TrailRunner AT(P Street Radial Tire-275/60R20 115S
Mickey Thompson Baja MTZP3 Mud Terrain Radial Tire - LT305/55R20 121Q
All 4 Seasons
Spring, Summer, Fall
Rim Width:
20 Inches
9 Inches
Tire Diameter:
20 inches
34.96 inches
Tread Depth:
11 32nds
65 32nds
Symmetrical Tread
Discontinued By Manufacturer
Goodyear Wrangler TrailRunner AT(P Street Radial Tire-275/60R20 115S
Goodyear Wrangler TrailRunner AT(P Street Radial Tire-275/60R20 115S
All 4 Seasons
Rim Width:
20 Inches
Tire Diameter:
20 inches
Tread Depth:
11 32nds
Symmetrical Tread
Discontinued By Manufacturer
Mickey Thompson Baja MTZP3 Mud Terrain Radial Tire - LT305/55R20 121Q
Mickey Thompson Baja MTZP3 Mud Terrain Radial Tire - LT305/55R20 121Q
Spring, Summer, Fall
Rim Width:
9 Inches
Tire Diameter:
34.96 inches
Tread Depth:
65 32nds
Symmetrical Tread
Discontinued By Manufacturer

What Do the Numbers 275 and 305 Mean?

The numbers 275 and 305 refer to the width of the tire in millimeters. A 275 tire is 275 mm wide, while a 305 tire is 305 mm wide. The width measures the tire from one side to the other, not including the rim.

Why Does the Width Matter?

The width of the tire affects how much contact the tire has with the road. More width generally means better grip, but it can also mean a bumpier ride. If you’re looking for improved handling, you might consider wider tires. However, wider tires could also affect other aspects like fuel efficiency and safety.

Difference Between 275 and 305 Tires

When selecting tires for your vehicle, understanding the nuances between different sizes can be pivotal. The 275 and 305 sizes are commonly chosen, but they cater to different vehicle types and have distinct characteristics. Let’s break it down.

Vehicle Compatibility:

  • 275 Tires: These are typically suited for larger SUVs and trucks. Some of the vehicles that can accommodate these tires include the RAM 1500, Ford F-150, Toyota Tundra, Cadillac Escalade, GMC Yukon, Jeep Wrangler, and Chevrolet Suburban.
  • 305 Tires: These are found on vehicles like the Nissan 370Z (2013 & 2014), Cadillac CTS-V (2015), Jaguar XKR (2009), BMW M6 (2015), and Dodge Challenger (2014).

How do I know my tire size?

tire size 305

Identifying Your Tire Size

Wondering how to determine the size of your tire? There are a couple of methods:

Door Jam Method: The simplest approach is to check the door jam of your vehicle. Here, you’ll find a manual or sticker detailing the tire’s specifications and maintenance guidelines.

Direct Inspection: By examining the tire itself, you can identify its size and specifications. This method is a tad more technical, as it requires understanding the numbers, letters, or symbols imprinted on the tire. For instance, consider the code P305/30R20 90S, often found on sidewalls.

  • P: Indicates a Passenger type.
  • 305: Represents the width in millimeters.
  • 30: This is the Aspect Ratio, calculated as a percentage by dividing the rim diameter by its width.
  • R: Stands for Radial, which refers to the pattern used in the construction. This pattern significantly impacts the stability. Other letters you might encounter include “D” for diagonal and “B” for bias-ply.

305 Tires. Fitting

  • 20: This number indicates the rim size in inches. In this example, it is compatible with a 20-inch rim diameter.
  • 90: Represents the Load Index, which is the maximum weight it can support.
  • S: This designates the speed rating. Each letter corresponds to a specific speed bracket.

It’s essential to familiarize yourself with these designations, as they provide valuable insights into your tire’s specifications. These standards are set by organizations responsible for tire standardization, including Euro-metric, P-metric, and LT-metric.

Feature 275 305
Vehicle Compatibility Larger SUVs & Trucks (e.g., RAM 1500, Ford F-150) Specific Models (e.g., Nissan 370Z, BMW M6)
Width (in mm) 275 mm 305 mm
Typical Aspect Ratio Varies, but common ratios include 55, 60, 65 Often around 30
Rim Diameter Compatibility Varies, but 18-inch and 20-inch are common Typically 20-inch
Load Index Varies based on specific tire Varies based on specific tire
Speed Rating Varies based on specific tire Varies based on specific tire
Construction Pattern Radial (R) is common Radial (R) is common

Different sizes

Tire sizes play a pivotal role in determining a vehicle’s performance, handling, and safety. With a myriad of options available, it’s essential to understand the distinctions and applications of each.

Commonly Encountered Sizes: Sizes can vary based on the vehicle’s purpose, design, and manufacturer’s specifications. Some frequently seen include:

  • 37-inch
  • 285/75R16
  • 33-inch
  • 275/70R18
  • 275/60R20
  • 35-inch
  • 285/70R17

Features & Specifications of 275’s

Goodyear Wrangler TrailRunner AT

The 275 is tailored for vehicles that require a 20.00-inch rim diameter. Here are its specifications:

  • Rim Width: Ranges between 7.50 inches and 9.50 inches.
  • Overall Diameter: Measures at 31.91 inches.
  • Sidewall Height: Stands at 5.95 inches.
  • Intended For: These are primarily designed for larger SUVs and trucks, ensuring stability and performance on various terrains.
  • Offers better gas mileage
  • They are not too heavy on the vehicle engines to pull
  • They cost less
  • They cannot operate outside the tolerant limit (terrain)
  • They wear easily and quickly


Features & Specifications of 305’s

Mickey Thompson Baja MTZP3 Mud Terrain Radial Tire

The 305, in contrast, is designed for a different set of vehicles. Here’s what you need to know:

  • Rim Diameter Compatibility: 20 inches.
  • Rim Width: Suitable for dimensions of 2011.0 and 2011.5.
  • Sidewall Height: Measures at 6.0 inches.
  • Cross-sectional Width: Spans 305 millimeters.
  • Ideal For: These are often seen on modified cars that can accommodate the P305/30R20 sizes.
  • Support vehicle with greater payload
  • Bring more stability to vehicles
  • Thicker and more durable
  • Weighty and require more power to pull them
  • Cost more


Common Difference Between 275 and 305


  • 275: These are lighter in comparison to 305.
  • 305: Being heavier, these have a more substantial gravitational pull. This increased weight allows for better surface contact with the road, enhancing the vehicle’s balance and traction.

Gas mileage

  • 275: Due to their lighter weight, 275 generally offer better gas mileage. They require less energy to move, thus conserving fuel.
  • 305: Their heavier nature means they demand more power, potentially leading to increased fuel consumption. However, advancements in technology can mitigate some of these effects.


  • 275: These are slimmer and might be more vulnerable to punctures when overloaded.
  • 305: Their robust build allows them to support larger loads. Their increased thickness offers protection against potential damage from road debris.


  • 275: While they offer decent stability, their narrower width might limit their grip on the road.
  • 305: With a broader width, these provide a more extensive surface grip, ensuring enhanced vehicle balance and stability.


Speed - Common Difference Between 275 and 305

  • 275: Their lighter weight and narrower width can contribute to higher speeds, as they face less rolling resistance.
  • 305: The added weight and width might slightly reduce their speed potential in comparison to 275.


  • 275: Generally, these have a shorter profile.
  • 305: Designed with a taller profile, they can provide vehicles with an elevated stance, beneficial for certain applications.


  • 275: While they are durable, their build might not be as rugged as the 305.
  • 305: Their thicker profile and robust construction make them tougher and more resistant to wear and tear.


  • 275: Primarily adapted for smooth, tarred roads. They might face challenges in challenging terrains.
  • 305: While they perform well on regular roads, their weight and height give them an edge in off-road terrains, be it rocky or sandy landscapes.

How Do These Sizes Affect Performance?

A 305 tire has more width than a 275 tire, which can result in better grip and stability on the road. This is especially helpful when making sharp turns or driving at high speeds. However, the additional width can make the vehicle harder to steer and less responsive.

What About Speed and Acceleration?

Tire width doesn’t directly affect speed, but it does impact acceleration. Wider tires like 305 can give you better acceleration because they grip the road better. On the flip side, 275 tires might offer quicker steering response, allowing you to navigate tight spaces more easily.

Which Size Should I Choose?

If you’re looking for better performance and grip, you might lean toward a 305 tire. If fuel efficiency and easier steering are more important, then a 275 tire could be a better choice. Always weigh your driving needs against what each tire size offers.

How Do I Make the Final Decision?

The final choice boils down to your personal preference and driving conditions. Consult your vehicle’s owner manual, think about your driving habits, and consider the climate in your area. It’s always good to consult with a tire professional for personalized advice as well.


275 and 305 faq

How much taller are the 305 than the 275?

Assuming both the 305 and 275 have the same aspect ratio (which is the ratio of the height of the tire’s sidewall to its width), the 305 will be approximately 1 inch taller than the 275 .

Will the 305 fit my 18inch rims?

It depends on the width of your 18-inch rims. The 305 are typically designed to fit on rims that are at least 10.5 inches wide. It’s important to check the specifications of your particular rims to ensure that they are compatible with the 305.

It’s also important to consider the aspect ratio and overall diameter of the tires to ensure proper fitment and avoid any rubbing or clearance issues. It’s recommended to consult with a tire specialist or mechanic for further guidance.

I want to add a little more height to my car. Which type will give me the lift I desire?

If you want to add a little more height to your car, you can consider getting a larger size with a larger sidewall. This will increase the overall diameter of the tire and add some extra height to your car.

However, it’s important to make sure that the larger size is compatible with your vehicle and doesn’t cause any clearance or rubbing issues. You should consult with a tire professional or your vehicle manufacturer to determine the best tire size for your specific car.

Having a tire that will give me a better mileage will be great. Which do you think will allow an improved mileage for my car?

Generally, narrower tires tend to provide better fuel efficiency compared to wider ones. Therefore, if you want to improve your car’s mileage, you may want to consider using 275 instead of 305 as they are narrower.

However, there are other factors that can affect your car’s fuel efficiency, such as pressure, driving habits, and road conditions, among others. It’s essential to keep your tires properly inflated and maintain them regularly to ensure the best fuel efficiency.

Can I install 305 on a 275 rim?

Originally 305 were made for a minimum of 10.5 inches rim while the 275 are made to have a minimum of 9.5 inches rim sizes. The problem with fitting the 305 on the 275 rims is that the giant tire will be rubbing, which may not suit your tires and cause them to damage quickly.

I would prefer more rugged tires for my truck. What option between 275 and 305 will help me achieve my purpose?

If you’re looking for more rugged tires for your truck, either the 275 or 305 could be a good option. However, generally speaking, wider tires like the 305 will provide more traction and stability on rough terrain, while narrower tires like the 275 may offer better handling and maneuverability on the road.

It ultimately depends on your specific needs and preferences, as well as the type of terrain you’ll be driving on. It’s recommended to consult with a tire expert or mechanic to determine the best option for your truck.


It is important to note that all tire types have their advantages and disadvantages, and they don’t have it all. We must be clear about the specifications of the types of tires we want and the purpose they should be directed to. Also, we have to pay keen attention to the various tire safety regulations, so they are used as recommended.

Your choice should align with your vehicle’s requirements and the conditions you frequently encounter. Always consult with a tire specialist to ensure the best fit for your needs. Safe Driving.

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