LT255/75R17 Tire Size

All You Need to Know About LT255/75R17 Tires

LT255/75R17 is a Light Truck–rated version of the 255/75R17 size, with the same physical dimensions - about 32.1 inches in overall diameter and 7.53 inches in sidewall height - but built with reinforced construction for higher load capacity and increased inflation pressure.

This page focuses on load behavior, construction, and pressure characteristics of LT255/75R17. For dimensional specifications, clearance, and size comparisons, see 255/75R17 tires. For passenger-rated behavior, see P255/75R17 tires.

Unlike passenger-rated tires, LT255/75R17 is designed to operate under higher load conditions, with stronger internal construction that limits deformation and maintains tread stability under weight.

LT255/75R17 Size Quick Specs

• Approved rim width range: 6.5–8.5"
• Best rim width fit: 7.0"–8.0"
• Width: 255 mm
• Sidewall height: 191.25 mm
• Overall diameter: ≈32.1"
• Wheel diameter: 17 in

Note: LT255/75R17 shares identical external dimensions with 255/75R17. Differences come from internal construction, load rating, and pressure limits rather than size.

What LT Means in LT255/75R17

The “LT” designation indicates a Light Truck tire built with reinforced casing and designed to carry higher loads at higher inflation pressures than passenger-rated tires of the same size.

While LT255/75R17 matches the physical dimensions of 255/75R17, it follows a different load standard, allowing it to maintain structural stability under heavier weight and more demanding operating conditions.

LT255/75R17 Load Range and Construction

LT255/75R17 is available in multiple load ranges, typically C, D, and E. These define how much pressure the tire can hold and how much load it can safely carry.

• LT255/75R17 Load Range C: lower pressure, more sidewall flexibility
• LT255/75R17 Load Range D: moderate pressure and increased load capacity
• LT255/75R17 Load Range E: highest pressure capability and maximum load stability

As load range increases, sidewall stiffness increases, reducing deformation under load and improving control during towing and hauling.

LT255/75R17 Load and Pressure Characteristics

LT255/75R17 operates at significantly higher inflation pressures than P-metric tires of the same size, often ranging between 50 psi and 80 psi depending on load range.

This higher pressure allows the LT255/75R17 tire to carry heavier loads while maintaining its structural shape. Under load, the reinforced casing reduces sidewall deflection, keeping the tread more stable and evenly distributed across the contact patch.

Compared with P255/75R17, LT255/75R17 sacrifices some ride comfort in exchange for improved load stability, durability, and resistance to heat buildup under sustained weight.

How the 7.53-Inch Sidewall Behaves in LT Construction

With a sidewall height of about 7.53 inches, LT255/75R17 still allows measurable deformation, but far less than a passenger-rated version due to its reinforced construction.

Under load, the LT255/75R17 stiffer casing limits sidewall flex, improving braking stability, steering response under weight, and resistance to deformation during off-road use or towing.

This reduced flex is critical in applications where maintaining tire shape under load directly affects control and durability.

LT255/75R17 Common Vehicle Applications

LT255/75R17 is commonly used on trucks and SUVs that operate under higher load demand or require reinforced durability.

• Jeep Wrangler and Gladiator (off-road and load-focused setups)
• Toyota Tacoma and 4Runner
• Ford Ranger and Bronco
• Nissan Frontier

Because the LT255/75R17 size is about 32 inches tall, clearance must still be verified at full steering angle and suspension compression. Construction does not change fitment size, but it changes how the tire behaves under load.

LT255/75R17 vs 255/75R17

• Dimensions: identical (≈32.1")
• Width: identical (255 mm)
• Difference: reinforced construction and higher load capacity

Because the LT255/75R17 and 255/75R17 sizes do not change, substitution depends on load requirements, not fitment. LT tires are selected when additional strength and pressure capacity are required.

LT255/75R17 vs P255/75R17

• Pressure range: higher in LT construction
• Sidewall behavior: stiffer, less deflection
• Load stability: greater under heavy demand

Compared with P255/75R17, the LT version is designed for heavier-duty use, including towing, hauling, and off-road conditions where structural strength is required.

When LT255/75R17 Is the Better Choice

• Vehicles carrying heavy loads or equipment
• Towing applications
• Off-road use requiring stronger sidewalls
• Situations where higher inflation pressure is needed

For daily driving without heavy load demands, P255/75R17 may provide a more compliant ride, while LT255/75R17 is better suited for durability and load stability.

Fitment Note for LT255/75R17

In LT255/75R17 applications, fitment must be evaluated separately for size and load. The physical dimensions match 255/75R17, but correct usage depends on load index, pressure capability, and whether the tire matches the vehicle’s operational demands.

When changing sizes or load ranges, it is also important to understand how the 3% rule applies and what additional factors influence safe fitment.