Tire Size 285/75r18 vs 35×12.5r18
The main difference between 285/75r18 and 35×12.5r18 tire size lies in the section width. While the 285/75r18 has a width of 11.22 inches, the 35×12.5r18 is wider at 12.52 inches. This 1.3-inch difference affects various performance factors.
| / | R |
| / | R |
| Parameter | 235/35 R18 | 205/40 R18 | Differ. |
|---|---|---|---|
| Tire Height | |||
| Section Width | |||
| Circumference | |||
| Sidewall Height | |||
| Revolutions | |||
| Rim Size |
Fitment Guide
The overall diameter difference between these sizes is minor at 0.2 inches. Replacement tires should be within 3% diameter difference, so fitment between these sizes is straightforward.
However, the wider 35×12.5r18 may require wider wheels and could rub on stock suspension without adjustments.
Ground Clearance
With a 0.2-inch larger diameter, the 35×12.5r18 provides slightly more ground clearance than the 285/75r18. This minor clearance increase offers a slight advantage in rough terrain.
Still, it likely won’t be noticeable in most on-road driving. The marginal diameter difference causes a minor 0.66 mph speedometer variance.
Fuel Economy
The wider and heavier 35×12.5r18 has slightly higher rolling resistance, decreasing fuel economy compared to the 285/75r18. With less tread in contact with the road, the narrower 285/75r18 provides better efficiency.
Ride Comfort
The 35×12.5r18 larger air volume and 0.1-inch taller sidewall give it better cushioning and impact absorption.
This provides a smoother ride over bumps and uneven pavement compared to the 285/75r18. However, both offer comfortable on-road performance.
Appearance
The 35×12.5r18 beefier footprint visually looks more aggressive and muscular than the narrower 285/75r18. The squared-off shoulder and wider stance enhance aesthetic appeal. However, subjective preferences vary.
Handling & Stability
The 285/75r18 narrower tread width provides sharper steering response and quicker turning compared to the 35×12.5r18.
But the wider tire has a larger contact patch for improved grip and traction, especially in inclement weather. Both deliver stable handling.
Noise & Vibration
The 35×12.5r18 added air volume and absorptive sidewall characteristics reduce road noise and vibration transmission.
The 285/75r18 shorter sidewall is stiffer, transmitting more noise and vibration into the cabin. However, the differences are minor.
Durability & Wear
With 11.6% more tread width contacting the road, the 35×12.5r18 is prone to more rapid wear. The narrower 285/75r18 concentrates wear over less area, potentially increasing tread life. Proper maintenance mitigates wear issues for both.
Off-Road Ability
The 35×12.5r18 provides better traction and flotation in muddy or loose terrain than the 285/75r18. The wider footprint and tread help prevent sinking in soft surfaces. Ground clearance is also marginally better.
Ice Traction
The narrower 285/75r18 can sometimes cut through to the pavement more effectively on snow-covered roads.
But the 35×12.5r18 wider and heavier tread produces more bite for acceleration traction. Performance differences are minor in winter conditions.
What Does 285 75r18 Tire Mean?
The 285 75r18 tire size is a common choice for trucks and SUVs. The “285” refers to the tire’s width in millimeters, while the “75” indicates that the sidewall is 75% as tall as the width. The “r18” means this is a radial tire with an 18-inch diameter.
What Does 35×12 5r18 Tire Mean?
The “35” in the 35×12 5r18 tire size refers to the tire’s height. The “12.50” indicates that the tire’s width is 12.50 inches, and the “r18” means that it is a radial tire with an 18-inch diameter.
Our Observation
After comparing the 285/75r18 and 35×12.5r18 tire sizes, we observe that the 35×12.5r18 offers modest advantages in some areas, like ground clearance, cushioning, and off-road capability, thanks to its slightly larger size.
However, both tires deliver a stable, comfortable ride in most conditions. The wider 35×12.5r18 has a tougher aesthetic appeal. Overall, either tire suits most trucks and large SUVs well.
The differences are not major, so owners can choose based on personal preferences for appearance and intended use.
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.
