Understanding 305 35r24 Tire Sizes for Lifted Trucks

Understanding 305 35r24 Tire Sizes

When it comes to tires, the numbers and letters used to describe them can seem like a foreign language to many drivers. However, learning how to decipher tire sizing codes like 305 35r24 is important for understanding the functionality and fitment of different tire and wheel combinations.

305 35r24 is a common tire size used on many lifted trucks and SUVs, especially in popular truck trends like the Cali lean. By breaking down the sizing code digit by digit, we can gain a better understanding of how this tire size works.

The Aspect Ratio - 35

The 35 in 305 35r24 refers to the aspect ratio of the tire, also known as the profile. This is the ratio of the tire's section height to its section width, expressed as a percentage. So for a 305 35r24 tire, the section height is 35% of the section width.

A lower aspect ratio like 35 indicates a shorter sidewall, which typically provides better handling and performance. However higher aspect ratios will have more cushioning from impacts and debris. Most lifted trucks run low profile tires for an aggressive look.

The Section Width - 305

The 305 refers to the width of the tire in millimeters when mounted and measured on the wheel. So a 305 metric tire will measure 305mm across from sidewall to sidewall.

Wider tires like 305 mm require wider wheels with low offset to avoid rubbing. They also provide more traction and shoulder support for off-road use. However, excessively wide tires can decrease fuel economy.

The Wheel Diameter - 24

The 24 indicates the diameter of the wheel that the tire is designed to fit, measured in inches. 305 35r24 tires are intended to mount on 24 inch diameter wheels.

Larger wheel diameters like 24 inches allow for larger brake systems and help achieve a jacked up look. But they cause changes to speedometer accuracy and suspension geometry.

The Service Description - R

The R in 305 35R24 indicates that it is a radial tire. Radial tires have the ply cords arranged at 90 degrees to the direction of travel, which provides better flexibility and tread life.

Radial tires are standard for modern passenger vehicles. The only other commonly used type is bias ply tires, designated with a D, which have the ply cords at 30-45 degrees.

Lifting Compatibility

The 305 35r24 size has excellent compatibility with lifted truck suspensions. At 35 inches tall and nearly 12 inches wide, it matches the diameter and footprint needed to fit large lift kits designed for the 24 inch wheel diameter.

The low aspect ratio sidewall helps reduce flex and potential tire rub at full compression when heavily lifted. And the tread width provides lateral grip and stability when off-camber on a suspension lift.

Measuring 305 35r24 Tires

When mounted on a 24 inch wheel, a 305 35r24 tire will measure:

• Overall diameter: Approximately 35 inches
• Section width: 12.01 inches
• Sidewall height: 4.25 inches
• Wheel circumference: 75.4 inches

These specifications are important for calculating speedometer accuracy and selecting compatible lift kits.

Speedometer Calibration

The diameter change from stock wheels to 305 35r24 on a 24 inch rim can make the speedometer inaccurate. It's important to recalibrate it to avoid speeding tickets or unsafe speeds.

At 35 inch overall diameter, 305 35r24 tires produce 3.54% more diameter than a 27.7 inch stock setup. On a vehicle with 68 mph correct speed, indicated speed would be 70 mph without recalibration.

Lift Kit Fitment

A 305 35r24 tire requires a minimum of 6 inches of lift to avoid rubbing at full compression. But 8-12 inches of lift is ideal for fitting the large diameter and allowing extra droop when aired down off-road.

Many lift kits for 3/4 and 1 ton trucks are designed around the 305 35r24 tire size. This includes lift heights from 6 inches for a budget boost to over 12 inches for maximum clearance.

Conclusion

Understanding tire sizing is crucial for getting the right fit, performance, and look from aftermarket wheels and tires. The 305 35r24 is a common choice for lifted truck owners seeking maximum impact.

By decoding the measurements of 305mm width, 35 aspect ratio, 24 inch rim diameter, and radial design, we can better comprehend the capabilities and limitations of this tire size. Proper sizing, lift compatibility, and speedometer calibration are key.

FAQs

What vehicles fit 305 35r24 tires?

The 305 35r24 size fits lifted 3/4 and 1 ton trucks and SUVs, such as Chevy Silverado, GMC Sierra, Ford F-250/350, Dodge Ram 2500/3500, Toyota Tundra, Nissan Titan, and Jeep Wrangler.

Do I need a lift kit for 305 35r24 tires?

Yes, a lift kit is required to fit 35r24 tires without rubbing. A minimum of a 6 inch lift is needed, but 8-12 inches is ideal for maximum clearance and suspension droop when off-road.

Will 305 35r24 tires rub on my truck at full lock?

Some minor rubbing at full lock is common with this size. Adding a leveling kit, adjusting steering stops, and modifying inner fender liners can help eliminate turn lock rub.

What kind of wheels do I need for 305 35r24 tires?

305 35r24 tires are designed to fit 24x14 inch wheels. Wide -44 to -76 offset wheels between 14 and 18 inches wide are recommended to fit the 12 inch tread width.

Will my speedometer work with 305 35r24 tires?

The speedometer will read 3-4% lower than your actual speed with 35r24 tires. Recalibrating it is recommended to avoid speeding tickets or unsafe speed differentials.