Tire Size 265/70r15 vs 235/75r15
While the two sizes may seem similar, there are some key differences to be aware of before making the change. Let’s dive into the details and explore what you need to know.
- Narrower tires may slightly improve fuel efficiency due to reduced rolling resistance
- Cornering stability and traction may be slightly reduced with the narrower tires
- Speedometer will read 2.5% faster, so actual speed will be slightly lower than indicated
- Narrower tires have a smaller contact patch, which may affect braking performance
- Ground clearance will be reduced by approximately 0.36 inches (9.25 mm)
265/70r15 vs 235/75r15
Fitment Guide
When swapping between differing tire diameters, it’s best to stay within 3% of the original size to prevent clearance or speedometer issues.
At just 2.5% difference in diameter, both these sizes work as replacements. However, the 30mm width increase from 235 to 265 is substantial, so mechanical adjustments may be needed to prevent rubbing, especially at full lock.
Gas Mileage
The narrower 235/75R15 is slightly more fuel-efficient. Its more minor contact patch produces less rolling resistance, while its lighter weight decreases rotational inertia.
Together, this net fuel savings making the 235/75R15 an excellent eco-friendly choice.
Ground Clearance
With a diameter 2.5% larger, the 265/70R15 provides an extra 9.25mm of ground clearance over the 235/75R15.
This modest increase clears minor obstructions better, conferring a slight off-road advantage. However, it causes a 1 mph speedometer error.
Ride Comfort
While the softer sidewall of the 75 aspect ratio absorbs imperfections well, the 265 wider tread better distributes weight, smoothing the ride.
And with extra clearance, it handles large bumps and dips more comfortably. Overall, the wider 265/70R15 provides a slightly more compliant ride.
Aesthetics
The chunkier 265 width fills wheel wells more fully. Combined with the subtly stretched look of the taller 70-aspect sidewall, it gives a rugged persona well-suited to trucks and SUVs. The 235, while fine aesthetically, looks marginally under-tired by comparison.
Handling & Stability
The 235 narrower tread responds more immediately to steering inputs, providing sharp turn-in and handling precision.
But the 265 broader contact patch supplies steadier grip and stability when pushed hard into corners or when braking. There are minor trade-offs either way.
Noise & Vibration
Similar in ride quality, the 235 transmits slightly more road noise due to its shorter sidewall. But the differences are minor, and both absorb irregularities well to provide a smooth, quiet ride.
Durability & Wear
With 11.3% more tread area to share the load, the wider 265/70R15 distributes wear more evenly across its contact patch, promoting long, even tread life. It better resists curb damage with more rubber buffering the wheel.
Adverse Conditions
Performance differences between snow, rain and loose dirt are modest at best. The narrower 235/75R15 cuts through powder and standing water efficiently, while the 265/70R15 meets the ground more squarely to find traction off-road.
Can I Use 265/70r15 Instead of 235/75r15?
Yes, you can use 265/70r15 tires instead of 235/75r15 tires. The diameter difference between these two tires is 2.5%, within the recommended 3% variance.
Additionally, verify that the load capacity meets or exceeds the capacity of the original 235/75r15 tires. As long as the diameter variance and load capacity requirements are met, switching to 265/70r15 tires is acceptable.
How Much Taller Is A 265/70r15 Tire Than A 235/75r15?
The 265/70r15 tire is 0.73 inches (18.5 mm) taller than the 235/75r15 tire, representing a 2.5% increase in diameter.
The overall height of the 265/70R15 tire is 29.61 inches or 752mm, while the 235/75R15 tire is 28.88 inches or 733.5 mm tall.
How Much Wider Is A 265/70r15 Tire Than A 235/75r15?
The 265/70r15 tire is 1.18 inches (30 mm) wider than the 235/75r15 tire, indicating an 11.3% increase in width.
The 265/70r15 tire has a width of 10.43 inches or 265mm. In comparison, the 235/75r15 tire width measures 9.25 inches or 235mm.
What is the Main Difference Between 265/70r15 and 235/75r15?
The primary difference between 265/70R15 and 235/75R15 tires is the width. The 265/70R15 tires are 1.18 inches (30 mm) wider than 235/75R15 tires.
Our Observations
Switching from 265/70R15 to 235/75R15 tires is a viable option that will have a relatively small impact on most vehicles. The 2.5% smaller overall diameter is within the ±3% guidelines and won’t drastically alter the driving experience.
On-road, you may notice improved ride quality and slightly better fuel economy, but cornering traction will be reduced and the speedometer will read high by 2.5%. Off-road, the narrower tires with their taller sidewalls are more susceptible to damage and will provide less traction overall.
For most daily driving, 235/75R15 tires are a reasonable substitute for 265/70R15. However, if your vehicle sees a lot of heavy off-road use, sticking with the original 265/70R15 size is likely the better choice. As always, make sure to have your speedometer recalibrated after any tire size change.
Meet Caitlin McCormack, a Tire Size Expert and Blogger Passionate About Everything Related to Tires. With Years of Experience in the Tire Industry, Caitlin Has Become an Expert in Tire Sizes and Their Impact on Vehicle Performance.