Tire Size 30×9.5r15 vs 235/75r15

30×9.5r15 vs 235/75r15

The main difference between 30×9.5R15 and 235/75R15 tires is their diameter. 30×9.5R15 tires have a diameter of 29.5 inches, while 235/75R15 tires have a diameter of 28.3 inches. This means that 30×9.5R15 tires are 1.2 inches larger in diameter than 235/75R15 tires.

30x9.5r15 vs 23575r15

Fitment Guide

Replacement tires should be within 3% of the original tire’s diameter to avoid any issues. Going beyond this can require modifications like a lift kit to accommodate the new size.

The 30×9.5r15 is 3.7% larger in overall diameter than the 235/75r15, so it may need adjustments to prevent rubbing or other problems.

Ground Clearance

With a diameter 1.11 inches larger, the 30×9.5r15 provides more ground clearance than the 235/75r15. This extra clearance is useful for off-roading by helping prevent scrapes over rocks or obstacles.

However, the larger 30×9.5r15 diameter also causes a lower speedometer reading compared to the 235/75r15.

Gas Mileage

The 235/75r15’s more minor contact patch and lower rotational mass provide better fuel efficiency compared to the heavier 30×9.5r15.

This makes the 235/75r15 better for daily driving and long trips where mpg is important.

Ride Comfort

While the 235/75r15 offers a smoother highway ride, the 30×9.5r15’s taller sidewalls provide superior impact absorption on rough terrain. The extra cushioning smooths out bumps for a more comfortable off-road ride.


The 235/75r15 contributes to a vehicle’s aerodynamics, whereas the taller 30×9.5r15 has a more aggressive “monster truck” look at the expense of aerodynamic efficiency.

Handling & Stability

The shorter sidewalls of the 235/75r15 give it quicker steering response and handling precision on pavement.

But the 30×9.5r15’s additional sidewall flex provides better stability and traction off-road or on loose surfaces.

Noise & Vibration

The 235/75r15 transmits more road noise and vibration on smooth roads. But the 30×9.5r15’s taller sidewalls dampen noise and vibration better, especially over bumps and uneven terrain.

Durability & Wear

The 235/75r15 exhibits more even treadwear and has the potential for longer life. The larger and heavier 30×9.5r15 can introduce additional wear on suspension and drivetrain components.

Adverse Conditions

In snow or ice, the narrower 235/75r15 can cut through to the pavement more effectively. But in specific off-road conditions like mud, the wider 30×9.5r15 provides superior traction.

Speedometer Difference

Due to its larger diameter, the 30×9.5r15 causes a lower speedometer reading than the 235/75r15.

At an actual speed of 20 mph, the speedometer reads 19.26 mph with the 30×9.5r15 installed, a difference of 0.74 mph.

What Does 30×9 50r15 Tire Mean?

The “30” in the 30×9 50r15 means the tire’s diameter in inches. The 9.50 means that the tire’s width is nine and a half inches. The “R” stands for radial, which is the most common type of tire. The 15 means that the tire is designed to fit a 15-inch wheel.

The 30x950r15 size is a popular choice for off-road vehicles, as the wider width provides better traction in mud and sand. The taller sidewall also helps to absorb shocks from bumps and potholes.


What Does 235 75r15 Tire Mean?

The “235” in 235 75r15 means the width of the tire in millimeters. The “75” means that the sidewall height is 75% of the width. The “R” stands for radial, and the 15 indicates that the tire is designed to fit a 15-inch wheel.

The 235 75r15 size is a popular choice for on-road vehicles, as the narrower width provides better handling and fuel economy. The shorter sidewall also means that the tire is less likely to be damaged by potholes and other road hazards.

Our Observation
When comparing 30×9.5r15 and 235/75r15 tires, it’s clear that each excels in different areas. The larger 30×9.5r15 is tailored towards off-road use, with its added ground clearance, cushioning, traction, and bold styling, giving it a capability advantage in rugged conditions.

However, the 235/75r15’s smaller size makes it more well-rounded for daily street driving. Factors like ride comfort, handling, lower road noise, improved fuel economy, and longer treadwear make the 235/75r15 a better choice if you spend the most time on paved roads.

Ultimately, analyzing your typical driving habits and needs is crucial when deciding between these two tire sizes. Test drives can provide meaningful insight into how they perform across different surfaces. Selecting the right tire comes down to choosing the one best aligned with the conditions you face the most.

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