LT285/75R17 Tire Size

All You Need to Know About LT285/75R17 Tires

LT285/75R17 is a light truck (LT) tire size where load capacity is defined by reinforced construction and higher inflation pressure capability. Its external dimensions match 285/75R17, with an overall diameter of ≈33.8" to 34.1" and a sidewall height of ≈8.4 inches.

This page focuses on how LT construction affects load capacity, pressure behavior, and real-world performance under towing and heavy-duty use. For dimensional behavior and fitment considerations, see 285/75R17 tires.

At the LT285/75R17 size, LT construction features stronger sidewalls and higher allowable inflation pressure than P-metric sizes. Maximum pressure in LT285/75R17 tires varies by load range: Load Range C is rated to 50 psi, Load Range D to 65 psi, and Load Range E to 80 psi. This directly determines how the tire carries load, responds to deflection, and resists deformation under stress - with higher load ranges offering greater resistance to sidewall flex under heavy towing or payload conditions.

LT285/75R17 Size Quick Specs

• Overall diameter: ≈33.8" to 34.1"
• Width: 285 mm
• Sidewall height: ≈8.4"
• Rim width range: 7.5–9.5"
• Typical pressure range: 50–80 psi (depending on load range)

What LT Means in LT285/75R17

The “LT” designation in the LT285/75R17 size identifies a light truck tire built for higher load capacity and durability. Unlike passenger (P-metric) or Euro-metric tires, LT tires are designed to carry heavier loads at higher pressures using reinforced internal construction.

At the ≈33.8-inch diameter of LT285/75R17, this size is commonly used on trucks and SUVs that operate under towing, hauling, or off-road conditions. The LT designation ensures that the tire can maintain structural integrity under these higher stress levels.

LT285/75R17 Load Capacity and Pressure Behavior

In LT285/75R17, load capacity increases with inflation pressure within the tire’s rated limits. Higher pressure reduces sidewall deflection, stabilizes the contact patch, and improves load-carrying capability.

Compared to non-LT tires of the same size, LT285/75R17 exhibits reduced sidewall flex under load. This improves stability during towing and heavy hauling but results in a firmer ride and reduced compliance over uneven surfaces.

The tall ≈8.4-inch sidewall still allows deformation for off-road traction, but the reinforced construction limits excessive flex, helping maintain control under load.

LT285/75R17 vs 285/75R17

• Dimensions: identical (≈33.8")
• Width: identical (285 mm)
• Difference: construction, load capacity, and pressure range

Because dimensions are identical, substitution between LT285/75R17 and 285/75R17 is not a fitment issue. The decision must be based on load requirements, inflation pressure capability, and vehicle usage conditions.

Comparison of LT285/75R17 With Similar LT Sizes

LT285/75R17 is commonly compared with LT275/70R17 and LT285/70R17, which represent two different substitution scenarios.

LT285/75R17 vs LT275/70R17

• Width: LT275/70R17 is 10 mm narrower than LT285/75R17
• Overall diameter: LT275/70R17 is about 1.67 inches (4.9%) smaller than LT285/75R17 

The 4.9% difference between LT275/70R17 and LT285/75R17 clearly exceeds the ±3% acceptable threshold. The LT275/70R17 is not a safe direct substitute for LT285/75R17 without accounting for significant impacts on ground clearance, drivetrain load, and speedometer accuracy.

LT285/75R17 vs LT285/70R17

• Width: Identical (285 mm)
• Overall diameter: LT285/70R17 is about 1.12 inches (3.3%) smaller than LT285/75R17 

The 3.3% difference between LT285/70R17 and LT285/75R17 exceeds the ±3% acceptable threshold, placing these sizes outside direct substitution limits without accounting for drivetrain and clearance changes.

LT285/75R17 Fitment Note

For LT285/75R17, dimensional compatibility is only the starting point. Load range, inflation pressure, and vehicle load requirements must be verified together to ensure safe operation, particularly in towing and heavy-duty applications.